[tests] Spliting literals downcast tests into commom and bridged

Author: LucianoPAlmeida

test/expr/cast/literals_downcast.swift

@@ -1,7 +1,4 @@
-// RUN: %target-typecheck-verify-swift -enable-objc-interop
-// REQUIRES: objc_interop
-
-import Foundation
+// RUN: %target-typecheck-verify-swift
 
 let ok = "A" as Character // OK
 let succeed = "A" as? String // expected-warning {{always succeeds}}
@@ -18,10 +15,6 @@ let okUInt = 1 as UInt // OK
 let badUInt = 1 as? UInt // expected-warning {{conditional downcast from literal to 'UInt' always fails; consider using 'as' coercion}} {{none}}
 let badUInt1 = 1.0 as? UInt // expected-warning {{cast from 'Double' to unrelated type 'UInt' always fails}}
 
-// Can downcast by bridging
-let bridge = "A" as? NSString // expected-warning {{always succeeds}}
-let bridge1 = 1 as? NSNumber // expected-warning {{always succeeds}}
-
 // Custom protocol adoption
 struct S: ExpressibleByStringLiteral {
   typealias StringLiteralType = String

test/expr/cast/literals_downcast_bridge.swift

@@ -0,0 +1,8 @@
+// RUN: %target-typecheck-verify-swift -enable-objc-interop
+// REQUIRES: OS=macosx
+
+import Foundation
+
+// Can downcast by bridging
+let bridge = "A" as? NSString // expected-warning {{always succeeds}}
+let bridge1 = 1 as? NSNumber // expected-warning {{always succeeds}}