[clang] add requirements to -Wa,-W test cases.

Include linux as a test requirement.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@374837 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Driver/as-w-option.c b/test/Driver/as-w-option.c
index afaf1cf..96922ae 100644
--- a/test/Driver/as-w-option.c
+++ b/test/Driver/as-w-option.c
@@ -5,6 +5,9 @@
 // RUN: not %clang %s -c -o %t.o -integrated-as -Wa,--fatal-warnings 2>&1 | FileCheck --check-prefix=CHECK-AS-FATAL %s
 // RUN: not %clang %s -c -o %t.o -fno-integrated-as -Wa,--fatal-warnings 2>&1 | FileCheck --check-prefix=CHECK-AS-FATAL %s
 
+// REQUIRES: clang-driver
+// REQUIRES: linux
+
 // CHECK-IAS: "-cc1" {{.*}} "-massembler-no-warn"
 // CHECK-NOIAS: "-W"
 // CHECK-AS-NOWARN-NOT: warning: