remove workarounds for temporary lack of swift-syntax parity

Author: sophiapoirier

test/Concurrency/experimental_feature_strictconcurrency.swift

@@ -1,4 +1,3 @@
-// expected-error{{new Swift parser generated errors for code that C++ parser accepted}}
 // RUN: %target-swift-frontend -disable-availability-checking -parse-as-library -enable-experimental-feature StrictConcurrency -enable-experimental-feature GlobalConcurrency -emit-sil -o /dev/null -verify %s
 // RUN: %target-swift-frontend -disable-availability-checking -parse-as-library -enable-experimental-feature StrictConcurrency=complete -enable-experimental-feature GlobalConcurrency -emit-sil -o /dev/null -verify %s
 // RUN: %target-swift-frontend -disable-availability-checking -parse-as-library -enable-experimental-feature StrictConcurrency=complete -enable-experimental-feature GlobalConcurrency -emit-sil -o /dev/null -verify -enable-experimental-feature SendNonSendable %s
@@ -49,7 +48,8 @@ final class TestNonsendable {
 struct A {
   static let immutableExplicitSendable = TestSendable()
   static let immutableNonsendableGlobal = TestNonsendable() // expected-warning{{static property 'immutableNonsendableGlobal' is not concurrency-safe because it is not either conforming to 'Sendable' or isolated to a global actor}}
-  static nonisolated(unsafe) let immutableNonisolatedUnsafeGlobal = TestNonsendable() // expected-error{{unexpected code '(unsafe)' in variable}}
+  static nonisolated(unsafe) let immutableNonisolatedUnsafeGlobal = TestNonsendable()
+  static nonisolated let immutableNonisolatedGlobal = TestNonsendable() // expected-warning{{static property 'immutableNonisolatedGlobal' is not concurrency-safe because it is not either conforming to 'Sendable' or isolated to a global actor}}
   static let immutableInferredSendable = 0
   static var mutable = 0 // expected-warning{{static property 'mutable' is not concurrency-safe because it is non-isolated global shared mutable state}}
   // expected-note@-1{{isolate 'mutable' to a global actor, or convert it to a 'let' constant and conform it to 'Sendable'}}