CHECK-LABEL-ify some code gen tests to improve diagnostic experience when tests fail.

llvm-svn: 188447
diff --git a/clang/test/CodeGen/arm-pcs.c b/clang/test/CodeGen/arm-pcs.c
index fc658c3..269f01e 100644
--- a/clang/test/CodeGen/arm-pcs.c
+++ b/clang/test/CodeGen/arm-pcs.c
@@ -6,7 +6,7 @@
 aapcs_fn bar;
 
 int foo(aapcs_vfp_fn baz) {
-// CHECK: define i32 @foo
+// CHECK-LABEL: define i32 @foo
 // CHECK: call arm_aapcscc
 // CHECK: call arm_aapcs_vfpcc
   return bar() + baz();