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

llvm-svn: 188447
diff --git a/clang/test/CodeGenCXX/bool-bitfield.cpp b/clang/test/CodeGenCXX/bool-bitfield.cpp
index 3e3b070..a5a344f 100644
--- a/clang/test/CodeGenCXX/bool-bitfield.cpp
+++ b/clang/test/CodeGenCXX/bool-bitfield.cpp
@@ -9,6 +9,6 @@
 {
     if ((a1.m_sorted = b)) {}
 }
-// CHECK: define void @_Z5func1bR1A
+// CHECK-LABEL: define void @_Z5func1bR1A
 // CHECK: br i1
 // CHECK: ret void