Interpreter: mark some tests as REQUIRES: objc_interop

These tests require the ObjC Foundation framework currently (although it
should be possible have them use the swift corelibs Foundation project
to satisfy this requirement).  Marking the tests indicates that these
tests do not have the dependencies to run on Windows.

Author: compnerd

test/Interpreter/SDK/multi-file-imported-enum.swift

@@ -2,9 +2,9 @@
 // RUN: %target-build-swift -module-name test -whole-module-optimization %s %S/Inputs/multi-file-imported-enum/main.swift -o %t/a.out
 // RUN: %target-codesign %t/a.out
 // RUN: %target-run %t/a.out | %FileCheck %s
-// REQUIRES: executable_test
 
-// XFAIL: linux
+// REQUIRES: executable_test
+// REQUIRES: objc_interop
 
 import Foundation
 

test/Interpreter/builtin_bridge_object.swift

@@ -2,10 +2,11 @@
 // RUN: %target-build-swift -parse-stdlib %s -o %t/a.out
 // RUN: %target-codesign %t/a.out
 // RUN: %target-run %t/a.out | %FileCheck %s
+
 // REQUIRES: executable_test
+// REQUIRES: objc_interop
 
 // FIXME: rdar://problem/19648117 Needs splitting objc parts out
-// XFAIL: linux
 
 import Swift
 import SwiftShims

test/Interpreter/varargs.swift

@@ -1,7 +1,7 @@
 // RUN: %target-run-simple-swift | %FileCheck %s
-// REQUIRES: executable_test
 
-// XFAIL: linux
+// REQUIRES: executable_test
+// REQUIRES: objc_interop
 
 import Foundation