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

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

clang/test/Driver/mips-fsf.cpp

@@ -1,3 +1,5 @@
+// REQUIRES: mips-registered-target
+
 // Check frontend and linker invocations on FSF MIPS toolchain.
 //
 // = Big-endian, mips32, hard float

clang/test/Driver/mips-img-v2.cpp

@@ -1,3 +1,5 @@
+// REQUIRES: mips-registered-target
+
 // Check frontend and linker invocations on the IMG v2 MIPS toolchain.
 
 // -EB -mips32r6 -mhard-float -mabi=32

clang/test/Driver/mips-img.cpp

@@ -1,3 +1,5 @@
+// REQUIRES: mips-registered-target
+
 // Check frontend and linker invocations on the IMG MIPS toolchain.
 //
 // = Big-endian, mips32r6

clang/test/Driver/sysroot.c

@@ -1,3 +1,5 @@
+// REQUIRES: x86-registered-target
+//
 // Check that --sysroot= also applies to header search paths.
 // RUN: %clang -target i386-unk-unk --sysroot=/FOO -### -E %s 2> %t1
 // RUN: FileCheck --check-prefix=CHECK-SYSROOTEQ < %t1 %s