Fix clang tests

Summary:
Add REQUIRES for target specific tests.

Patch by Azharuddin Mohammed.

Reviewers: apazos, weimingz, rsmith, ddunbar, spop, mgrang

Subscribers: sebpop, llvm-commits

Differential Revision: https://reviews.llvm.org/D25574

llvm-svn: 284517
diff --git a/clang/test/Driver/mips-cs.cpp b/clang/test/Driver/mips-cs.cpp
index bca2ab9..6ef4c5d 100644
--- a/clang/test/Driver/mips-cs.cpp
+++ b/clang/test/Driver/mips-cs.cpp
@@ -1,3 +1,5 @@
+// REQUIRES: mips-registered-target
+//
 // Check frontend and linker invocations on Mentor Graphics MIPS toolchain.
 //
 // = Big-endian, hard float