Fixed unit tests

Author: iCharlesHu

test/Constraints/Inputs/FakeFoundation.h

@@ -0,0 +1 @@
+#import <Foundation/Foundation.h>

test/Constraints/Inputs/FakeFoundation.swift

@@ -0,0 +1 @@
+// empty

test/Constraints/Inputs/imported_type.h

@@ -1,4 +1,4 @@
-#import <Foundation/Foundation.h>
+#import "FakeFoundation.h"
 
 @interface Data
 @end

test/Constraints/invalid_decl_ref.swift

@@ -1,8 +1,9 @@
-// RUN: %target-swift-frontend -module-name SomeModule -typecheck -verify -dump-ast -import-objc-header %S/Inputs/imported_type.h %s | %FileCheck %s
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -emit-module -emit-module-path %t/FakeFoundation.swiftmodule -module-name FakeFoundation %S/Inputs/FakeFoundation.swift -import-objc-header %S/Inputs/FakeFoundation.h -disable-availability-checking
 
 // REQUIRES: objc_interop
 
-import Foundation
+import FakeFoundation
 
 // CHECK: declref_expr type='module<SomeModule>'
 // CHECK-NEXT: type_expr type='Data.Type'

test/Frontend/foundation-module-shadowing.swift

@@ -1,3 +1,4 @@
+// REQUIRES: objc_interop
 // RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend -emit-module -emit-module-path %t/ShadowFoundation.swiftmodule -module-name ShadowFoundation %S/Inputs/ShadowFoundation.swift -disable-availability-checking
 // RUN: %target-typecheck-verify-swift -I %t -disable-availability-checking