[TaskLocal] don't omit availability checking in tests

This is to make sure the expanded macros can properly work with availability and values which may require availability

Author: ktoso

test/Concurrency/Runtime/async_task_locals_basic.swift

@@ -1,4 +1,4 @@
-// RUN: %target-run-simple-swift( -plugin-path %swift-plugin-dir -Xfrontend -disable-availability-checking -parse-as-library %import-libdispatch) | %FileCheck %s
+// RUN: %target-run-simple-swift( -plugin-path %swift-plugin-dir -parse-as-library %import-libdispatch) | %FileCheck %s
 
 // REQUIRES: executable_test
 // REQUIRES: concurrency
@@ -33,6 +33,17 @@ enum TL {
   static var clazz: ClassTaskLocal?
 }
 
+@TaskLocal
+@available(SwiftStdlib 5.1, *)
+var globalTaskLocal: StringLike = StringLike("<not-set>")
+
+@available(SwiftStdlib 5.10, *)
+struct LessAvailable {}
+
+@TaskLocal
+@available(SwiftStdlib 5.10, *)
+var globalLessAvailable: LessAvailable?
+
 @available(SwiftStdlib 5.1, *)
 final class ClassTaskLocal: Sendable {
   init() {