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

llvm-svn: 188447
diff --git a/clang/test/CodeGen/le32-libcall-pow.c b/clang/test/CodeGen/le32-libcall-pow.c
index 24a1bbc..1b8a7a3 100644
--- a/clang/test/CodeGen/le32-libcall-pow.c
+++ b/clang/test/CodeGen/le32-libcall-pow.c
@@ -9,7 +9,7 @@
 double pow(double, double);
 long double powl(long double, long double);
 
-// CHECK: define void @test_pow
+// CHECK-LABEL: define void @test_pow
 void test_pow(float a0, double a1, long double a2) {
   // CHECK: call float @powf
   float l0 = powf(a0, a0);