[Async CC] Add execution test for thin_to_thick.

test/IRGen/async/run-thintothick-int64-to-void.sil

@@ -0,0 +1,49 @@
+// RUN: %empty-directory(%t)
+// RUN: %target-build-swift-dylib(%t/%target-library-name(PrintShims)) %S/../../Inputs/print-shims.swift -module-name PrintShims -emit-module -emit-module-path %t/PrintShims.swiftmodule
+// RUN: %target-codesign %t/%target-library-name(PrintShims)
+// RUN: %target-build-swift -Xfrontend -enable-experimental-concurrency -parse-sil %s -emit-ir -I %t -L %t -lPrintShim | %FileCheck %s --check-prefix=CHECK-LL
+// RUN: %target-build-swift -Xfrontend -enable-experimental-concurrency -parse-sil %s -module-name main -o %t/main -I %t -L %t -lPrintShims %target-rpath(%t) 
+// RUN: %target-codesign %t/main
+// RUN: %target-run %t/main %t/%target-library-name(PrintShims) | %FileCheck %s
+
+// REQUIRES: executable_test
+// REQUIRES: swift_test_mode_optimize_none
+// REQUIRES: concurrency
+// UNSUPPORTED: use_os_stdlib
+
+import Builtin
+import Swift
+import PrintShims
+import _Concurrency
+
+sil public_external @printInt64 : $@convention(thin) (Int64) -> ()
+
+// CHECK-LL: define{{( dllexport)?}}{{( protected)?}} swiftcc void @afun2(%swift.task* {{%[0-9]+}}, %swift.executor* {{%[0-9]+}}, %swift.context* {{%[0-9]+}}) {{#[0-9]*}} {
+sil @afun2 : $@async @convention(thin) (Int64) -> () {
+entry(%int : $Int64):
+  %print = function_ref @printInt64 : $@convention(thin) (Int64) -> ()
+  %result = apply %print(%int) : $@convention(thin) (Int64) -> () // CHECK: 9999
+  return %result : $()
+}
+
+// CHECK-LL: define{{( dllexport)?}}{{( protected)?}} swiftcc void @test_apply_of_thin_to_thick(%swift.task* {{%[0-9]+}}, %swift.executor* {{%[0-9]+}}, %swift.context* {{%[0-9]+}}) {{#[0-9]*}} {
+sil @test_apply_of_thin_to_thick : $@async @convention(thin) () -> () {
+entry:
+  %f = function_ref @afun2 : $@async @convention(thin) (Int64) -> ()
+  %c = thin_to_thick_function %f : $@async @convention(thin) (Int64) -> () to $@async @callee_guaranteed (Int64) -> ()
+  %int_literal = integer_literal $Builtin.Int64, 9999
+  %int = struct $Int64 (%int_literal : $Builtin.Int64)
+  %app = apply %c(%int) : $@async @callee_guaranteed (Int64) -> ()
+  %result = tuple()
+  return %result : $()
+}
+
+sil @main : $@async @convention(c) (Int32, UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>) -> Int32 {
+bb0(%argc : $Int32, %argv : $UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>):
+  %test_apply_of_thin_to_thick = function_ref @test_apply_of_thin_to_thick : $@async @convention(thin) () -> ()
+  %result = apply %test_apply_of_thin_to_thick() : $@async @convention(thin) () -> ()
+
+  %out_literal = integer_literal $Builtin.Int32, 0
+  %out = struct $Int32 (%out_literal : $Builtin.Int32)
+  return %out : $Int32
+}