Merge pull request #8613 from adrian-prantl/cherry-pick-swift-release-6.0-lldb-Provide-a-better-error-message-for-missing-symbols-89433

[Cherry-pick into swift/release/6.0] [lldb] Provide a better error message for missing symbols (llvm#89433)

Author: adrian-prantl

lldb/source/Expression/IRExecutionUnit.cpp

@@ -476,7 +476,9 @@ void IRExecutionUnit::GetRunnableInfo(Status &error, lldb::addr_t &func_addr,
     }
 
     m_failed_lookups.clear();
-
+    ss.PutCString(
+        "\nHint: The expression tried to call a function that is not present "
+        "in the target, perhaps because it was optimized out by the compiler.");
     error.SetErrorString(ss.GetString());
 
     return;

lldb/test/API/lang/cpp/constructors/TestCppConstructors.py

@@ -47,7 +47,7 @@ def test_constructors(self):
         self.expect(
             "expr ClassWithDeletedDefaultCtor().value",
             error=True,
-            substrs=["Couldn't look up symbols:"],
+            substrs=["Couldn't look up symbols:", "function", "optimized out"],
         )
 
     @skipIfWindows  # Can't find operator new.