[Test] Added for call-as-async Optional<NS_EXTENSIBLE_STRING_ENUM>.

The underlying problem was fixed by the change for rdar://81590807 .
Add tests for the specific case that was originally reported.

rdar://80704382

Author: nate-chandler

test/Inputs/clang-importer-sdk/usr/include/ObjCConcurrency.h

@@ -6,6 +6,9 @@
 #define MAIN_ACTOR __attribute__((__swift_attr__("@MainActor")))
 #define MAIN_ACTOR_UNSAFE __attribute__((__swift_attr__("@_unsafeMainActor")))
 
+#define NS_EXTENSIBLE_STRING_ENUM __attribute__((swift_wrapper(struct)));
+typedef NSString *Flavor NS_EXTENSIBLE_STRING_ENUM;
+
 @protocol ServiceProvider
 @property(readonly) NSArray<NSString *> *allOperations;
 -(void)allOperationsWithCompletionHandler:(void (^)(NSArray<NSString *> *))completion;
@@ -88,6 +91,8 @@ typedef void (^CompletionHandler)(NSString * _Nullable, NSString * _Nullable_res
                                                      NSError *_Nullable,
                                                      BOOL))completionHandler
     __attribute__((swift_async_error(zero_argument, 3)));
+- (void)getIceCreamFlavorWithCompletionHandler:
+    (void (^)(Flavor flavor, NSError *__nullable error))completionHandler;
 @end
 
 @protocol RefrigeratorDelegate<NSObject>

test/SILGen/objc_async.swift

@@ -87,6 +87,8 @@ func testSlowServer(slowServer: SlowServer) async throws {
   let _: String = try await slowServer.findAnswerFailingly()
 
   let _: () -> Void = try await slowServer.obtainClosure()
+
+  let _: Flavor = try await slowServer.iceCreamFlavor()
 }
 
 func testGeneric<T: AnyObject>(x: GenericObject<T>) async throws {

validation-test/compiler_crashers_2_fixed/Inputs/rdar80704382.h

@@ -0,0 +1,25 @@
+#include <Foundation/Foundation.h>
+
+#pragma clang assume_nonnull begin
+
+typedef NSString *FileProviderItemIdentifier NS_EXTENSIBLE_STRING_ENUM;
+FileProviderItemIdentifier const
+    FileProviderRootContainerItemIdentifier NS_SWIFT_NAME(FileProviderItemIdentifier.rootContainer);
+FileProviderItemIdentifier const
+    FileProviderWorkingSetContainerItemIdentifier NS_SWIFT_NAME(FileProviderItemIdentifier.workingSet);
+FileProviderItemIdentifier const
+    FileProviderTrashContainerItemIdentifier NS_SWIFT_NAME(FileProviderItemIdentifier.trashContainer);
+typedef NSString *FileProviderDomainIdentifier NS_EXTENSIBLE_STRING_ENUM;
+
+@interface PFXObject : NSObject
++ (void)getIdentifierForUserVisibleFileAtURL:(NSURL *)url
+                           completionHandler:
+                               (void (^)(FileProviderItemIdentifier __nullable
+                                             itemIdentifier,
+                                         FileProviderDomainIdentifier __nullable
+                                             domainIdentifier,
+                                         NSError *__nullable error))
+                                   completionHandler;
+@end
+
+#pragma clang assume_nonnull end

validation-test/compiler_crashers_2_fixed/Inputs/rdar80704382.m

@@ -0,0 +1,23 @@
+#include "rdar80704382.h"
+
+#pragma clang assume_nonnull begin
+
+@implementation PFXObject
+- (instancetype)init {
+  if (self = [super init]) {
+  }
+  return self;
+}
++ (void)getIdentifierForUserVisibleFileAtURL:(NSURL *)url
+                           completionHandler:
+                               (void (^)(FileProviderItemIdentifier __nullable
+                                             itemIdentifier,
+                                         FileProviderDomainIdentifier __nullable
+                                             domainIdentifier,
+                                         NSError *__nullable error))
+                                   completionHandler {
+  completionHandler(@"item_id", @"file_id", NULL);
+}
+@end
+
+#pragma clang assume_nonnull end

validation-test/compiler_crashers_2_fixed/rdar80704382.swift

@@ -0,0 +1,20 @@
+// RUN: %empty-directory(%t)
+// RUN: %target-clang %S/Inputs/rdar80704382.m -I %S/Inputs -c -o %t/rdar80704382.o
+// RUN: %target-build-swift -Xfrontend -disable-availability-checking -import-objc-header %S/Inputs/rdar80704382.h -Xlinker %t/rdar80704382.o -parse-as-library %s -o %t/main
+// RUN: %target-codesign %t/main
+// RUN: %target-run %t/main | %FileCheck %s
+
+// REQUIRES: executable_test
+// REQUIRES: objc_interop
+
+func run() async throws {
+  // CHECK: item_id
+  // CHECK: file_id
+  print(try await PFXObject.identifierForUserVisibleFile(at: URL(fileURLWithPath: "/tmp/file")))
+}
+
+@main struct Main {
+  static func main() async throws {
+    try await run()
+  }
+}