[Mono.Android] fix crash on startup with EnableLLVM (dotnet#7188)

`dotnet new android` apps would crash on startup when built with
`-c Release -p:EnableLLVM=true`:

    07-20 08:55:44.642  2983  2983 F monodroid-assembly: Internal p/invoke symbol 'java-interop @ java_interop_jvm_list' (hash: 0x58c48fc8b89cb484) not found in compile-time map.
    ...
    07-20 08:55:44.834  3004  3004 F DEBUG   : signal 6 (SIGABRT), code -1 (SI_QUEUE), fault addr --------
    07-20 08:55:44.834  3004  3004 F DEBUG   : Abort message: 'Internal p/invoke symbol 'java-interop @ java_interop_jvm_list' (hash: 0x58c48fc8b89cb484) not found in compile-time map.'

`java_interop_jvm_list` should *never* be called on Android, it is the
result of `new AndroidRuntime()` having not been called yet?

The problem being that the static `Android.App.Application.cctor` was
somehow running *before* `JNIEnv.Initialize()` was complete? And this
only happens with LLVM?

Reviewing the code:

    [UnmanagedCallersOnly]
    internal static unsafe void Initialize (JnienvInitializeArgs* args)
    {
        //...
        SynchronizationContext.SetSynchronizationContext (Android.App.Application.SynchronizationContext);
    }

We do indeed access `Android.App.Application`...

To fix this, we can move this to a new method decorated with
`MethodImplOptions.NoInlining`. Apps built with LLVM now launch for
me.

However, we can't really enable the LLVM `Mono.Android-Tests` quite
yet. Read on!

~~ Known Issues ~~

* dotnet/runtime#73003

Using Profiled AOT and LLVM at the same time can hit:

    [ERROR] FATAL UNHANDLED EXCEPTION: System.PlatformNotSupportedException: Arg_PlatformNotSupported
    at System.Text.ASCIIUtility.GetIndexOfFirstNonAsciiByte_Intrinsified(Byte* , UIntPtr )
    at System.Text.Unicode.Utf8Utility.GetPointerToFirstInvalidByte(Byte* , Int32 , Int32& , Int32& )
    at System.Text.UTF8Encoding.GetCharCount(Byte* , Int32 )
    at System.String.CreateStringFromEncoding(Byte* , Int32 , Encoding )
    at System.Text.Encoding.GetString(Byte* , Int32 )
    at System.String.CreateStringForSByteConstructor(Byte* , Int32 )
    at System.String.Ctor(SByte* value)
    at Java.Interop.TypeManager.GetClassName(IntPtr )
    at Android.Runtime.JNIEnv.RegisterJniNatives(IntPtr , Int32 , IntPtr , IntPtr , Int32 )

For now we can set `AndroidEnableProfiledAot=false` for the LLVM tests.

* dotnet/runtime#73304

Some Java.Interop unit tests fail with:

    System.InvalidOperationException : InvalidOperation_EnumEnded
    at System.ArrayEnumerator.get_Current()
    at Cadenza.Collections.Tests.CollectionContract`1[[System.Int16, System.Private.CoreLib, Version=7.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].DisposeCollection(IEnumerable c)
    at Cadenza.Collections.Tests.CollectionContract`1[[System.Int16, System.Private.CoreLib, Version=7.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CopyTo()
    at System.Reflection.MethodInvoker.InterpretedInvoke(Object , Span`1 , BindingFlags )

* https://github.com/xamarin/java.interop/blob/a3de91efdaec04b3927b755a07018e8d26cfdc71/tests/Java.Interop-Tests/Cadenza.Collections/CollectionContract.cs#L205-L221
* https://github.com/xamarin/java.interop/blob/a3de91efdaec04b3927b755a07018e8d26cfdc71/tests/Java.Interop-Tests/Cadenza.Collections/CollectionContract.cs#L85-L86

The `InetAccess` category causes the `Mono.Android-Tests` suite to crash with:

    08-02 21:26:57.581  5154  5173 I NUnit   : System.NetTests.ProxyTest : 646.269 ms
    08-02 21:26:57.593  5154  5173 I droid.NET_Test: Explicit concurrent copying GC freed 20(95KB) AllocSpace objects, 0(0B) LOS objects, 59% free, 1054KB/2590KB, paused 1.469ms total 7.180ms
    08-02 21:26:57.594  5154  5173 I NUnit   : SslTest
    08-02 21:26:57.594  5154  5173 I NUnit   : HttpsShouldWork 
    08-02 21:26:57.858  5154  5181 D NetworkSecurityConfig: No Network Security Config specified, using platform default
    08-02 21:26:58.585  5154  5164 I droid.NET_Test: Background young concurrent copying GC freed 39658(2920KB) AllocSpace objects, 0(0B) LOS objects, 22% free, 1999KB/2590KB, paused 69.607ms total 194.902ms
    08-02 21:26:58.922  5154  5164 I droid.NET_Test: Background concurrent copying GC freed 12412(836KB) AllocSpace objects, 0(0B) LOS objects, 46% free, 6987KB/12MB, paused 2.127ms total 327.448ms
    08-02 21:26:58.953  5154  5181 I monodroid-timing: [1/0] LZ4 decompression time for <assembly_store>; elapsed: 0:0::75000
    08-02 21:26:58.954  5154  5181 W linker  : Warning: "/data/app/Mono.Android.NET_Tests-QcXozuJGB3EpfK6bvDvvMQ==/split_config.x86_64.apk!/lib/x86_64/libaot-System.Formats.Asn1.dll.so" has no DT_SONAME (will use libaot-System.Formats.Asn1.dll.so instead) and will not work when the app moves to API level 23 or later (https://android.googlesource.com/platform/bionic/+/master/missing-soname-enforced-for-api-level-23) (allowing for now because this app's target API level is still 21)
    08-02 21:26:59.037  5154  5181 I monodroid-timing: [1/0] LZ4 decompression time for <assembly_store>; elapsed: 0:0::129000
    08-02 21:26:59.038  5154  5181 W linker  : Warning: "/data/app/Mono.Android.NET_Tests-QcXozuJGB3EpfK6bvDvvMQ==/split_config.x86_64.apk!/lib/x86_64/libaot-System.Runtime.Numerics.dll.so" has no DT_SONAME (will use libaot-System.Runtime.Numerics.dll.so instead) and will not work when the app moves to API level 23 or later (https://android.googlesource.com/platform/bionic/+/master/missing-soname-enforced-for-api-level-23) (allowing for now because this app's target API level is still 21)
    08-02 21:26:56.680  5154  5154 W Instrumentation: type=1400 audit(0.0:432): avc: denied { search } for name="run" dev="vdc" ino=32774 scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:object_r:varrun_file:s0 tclass=dir permissive=0 app=Mono.Android.NET_Tests
    08-02 21:26:56.770  5154  5154 W Instrumentation: type=1400 audit(0.0:433): avc: denied { ioctl } for path="socket:[49468]" dev="sockfs" ino=49468 ioctlcmd=0x8946 scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:r:untrusted_app_25:s0:c512,c768 tclass=udp_socket permissive=0 app=Mono.Android.NET_Tests
    08-02 21:26:56.780  5154  5154 W Instrumentation: type=1400 audit(0.0:434): avc: denied { ioctl } for path="socket:[49468]" dev="sockfs" ino=49468 ioctlcmd=0x8946 scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:r:untrusted_app_25:s0:c512,c768 tclass=udp_socket permissive=0 app=Mono.Android.NET_Tests
    08-02 21:27:00.029  1540  1540 I Zygote  : Process 5154 exited due to signal 11 (Segmentation fault)

Not really any useful info here...

Disabled this category for now. We can file an issue for this one,
assuming it is different than the other issues.

Author: jonathanpeppers

build-tools/automation/azure-pipelines.yaml

@@ -379,7 +379,7 @@ stages:
         testName: Mono.Android_Tests-Aot
         project: tests/Mono.Android-Tests/Mono.Android-Tests.csproj
         testResultsFiles: TestResult-Mono.Android_Tests-$(ApkTestConfiguration)-Aot.xml
-        extraBuildArgs: /p:AotAssemblies=True /p:EnableLlvm=True
+        extraBuildArgs: /p:AotAssemblies=True /p:EnableLLVM=True
         artifactSource: bin/Test$(ApkTestConfiguration)/Mono.Android_Tests-Signed.apk
         artifactFolder: AotLlvm
 
@@ -691,13 +691,15 @@ stages:
 
     - template: yaml-templates/apk-instrumentation.yaml
       parameters:
-        # TODO: disable LLVM test, see: https://github.com/dotnet/runtime/issues/68914
+        # TODO: disable LLVM test, see:
+        # https://github.com/dotnet/runtime/issues/68914
+        # https://github.com/dotnet/runtime/issues/73304
         condition: false
         configuration: $(XA.Build.Configuration)
         testName: Mono.Android.NET_Tests-AotLlvm
         project: tests/Mono.Android-Tests/Runtime-Microsoft.Android.Sdk/Mono.Android.NET-Tests.csproj
         testResultsFiles: TestResult-Mono.Android.NET_Tests-$(XA.Build.Configuration)AotLlvm.xml
-        extraBuildArgs: -p:TestsFlavor=AotLlvm -p:EnableLlvm=true
+        extraBuildArgs: -p:TestsFlavor=AotLlvm -p:EnableLLVM=true -p:AndroidEnableProfiledAot=false
         artifactSource: bin/Test$(XA.Build.Configuration)/$(DotNetTargetFramework)-android/Mono.Android.NET_Tests-Signed.aab
         artifactFolder: $(DotNetTargetFramework)-AotLlvm
         useDotNet: true

src/Mono.Android/Android.Runtime/JNIEnv.cs

@@ -196,10 +196,17 @@ internal static unsafe void Initialize (JnienvInitializeArgs* args)
 			}
 
 #if !MONOANDROID1_0
-			SynchronizationContext.SetSynchronizationContext (Android.App.Application.SynchronizationContext);
+			SetSynchronizationContext ();
 #endif
 		}
 
+#if !MONOANDROID1_0
+		// NOTE: prevents Android.App.Application static ctor from running
+		[MethodImpl (MethodImplOptions.NoInlining)]
+		static void SetSynchronizationContext () =>
+			SynchronizationContext.SetSynchronizationContext (Android.App.Application.SynchronizationContext);
+#endif
+
 		internal static void Exit ()
 		{
 			/* Manually dispose surfaced objects and close the current JniEnvironment to

tests/Mono.Android-Tests/Runtime-Microsoft.Android.Sdk/Mono.Android.NET-Tests.csproj

@@ -22,10 +22,10 @@
     <AndroidUseNegotiateAuthentication>true</AndroidUseNegotiateAuthentication>
     <!--
       TODO: Fix excluded tests
-      For AOT, InetAccess excluded due to: https://github.com/dotnet/runtime/issues/56315
+      For $(EnableLLVM), InetAccess excluded due to: https://github.com/dotnet/runtime/issues/56315
     -->
     <ExcludeCategories>DotNetIgnore</ExcludeCategories>
-    <ExcludeCategories Condition=" '$(RunAOTCompilation)' == 'true' ">$(ExcludeCategories):InetAccess</ExcludeCategories>
+    <ExcludeCategories Condition=" '$(EnableLLVM)' == 'true' ">$(ExcludeCategories):InetAccess</ExcludeCategories>
     <ExcludeCategories Condition=" '$(UseInterpreter)' == 'true' ">$(ExcludeCategories):IgnoreInterpreter</ExcludeCategories>
   </PropertyGroup>