test: adjust tests for mandatory tail calls on Win64

Since we are force enabling the mandatory tail calls on Windows x64,
even at the expense of stack traces and debugging support, adjust the
tests to account for the difference.

Author: compnerd

test/IRGen/async/hop_to_executor.sil

@@ -20,8 +20,7 @@ import _Concurrency
 // CHECK-arm64e: call {{.*}} @llvm.coro.suspend.async{{.*}}(i32 0, i8* [[RESUME]], i8* bitcast (i8* (i8*)* @__swift_async_resume_get_context to i8*), i8* bitcast (void (i8*, [[INT]], [[INT]], %swift.context*)* @test_simple.1 to i8*), i8* [[RESUME]], [[INT]] %1, [[INT]] %2, %swift.context* {{%[0-9]+}})
 // CHECK: [[RET_CONTINUATION:%.*]] = bitcast void (%swift.context*)* {{.*}} to i8*
 // CHECK:  call i1 (i8*, i1, ...) @llvm.coro.end.async(i8* {{.*}}, i1 false, void (i8*, %swift.context*)* @[[TAIL_CALL_FUNC:.*]], i8* [[RET_CONTINUATION]]
-// CHECK-WIN: ret void
-// CHECK-SYSV: unreachable
+// CHECK: unreachable
 
 sil @test_simple : $@async (@guaranteed Optional<Builtin.Executor>) -> () {
 bb0(%0 : $Optional<Builtin.Executor>):

test/IRGen/async/non_musttail_target.sil

@@ -2,7 +2,7 @@
 // RUN: %target-swift-frontend -disable-legacy-type-info -parse-stdlib %s -disable-llvm-optzns -disable-swift-specific-llvm-optzns -disable-objc-interop -module-name main -emit-ir -o - | %FileCheck %s
 
 // REQUIRES: concurrency
-// REQUIRES: OS=wasi || OS=windows-msvc
+// REQUIRES: OS=wasi
 
 sil_stage canonical
 

test/IRGen/async/run-call-dynamic-void_to_void.swift

@@ -10,9 +10,6 @@
 // REQUIRES: concurrency_runtime
 // UNSUPPORTED: back_deployment_runtime
 
-// Windows does not do swiftailcc
-// XFAIL: OS=windows-msvc
-
 import _Concurrency
 
 

test/IRGen/async_dynamic_replacement.swift

@@ -1,8 +1,5 @@
 // RUN: %target-swift-frontend %s -emit-ir -disable-availability-checking -disable-objc-interop | %FileCheck %s
 
-// Windows does not do swiftailcc
-// XFAIL: OS=windows-msvc
-
 // REQUIRES: concurrency
 
 public dynamic func number() async -> Int {