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

llvm-svn: 188447
diff --git a/clang/test/CodeGenObjC/objfw.m b/clang/test/CodeGenObjC/objfw.m
index 98e3fb0..8e72867 100644
--- a/clang/test/CodeGenObjC/objfw.m
+++ b/clang/test/CodeGenObjC/objfw.m
@@ -8,7 +8,7 @@
 void test0(void) {
   [Test0 test];
 }
-// CHECK:    define void @test0()
+// CHECK-LABEL:    define void @test0()
 // CHECK:      [[T0:%.*]] = call i8* (i8*, i8*, ...)* (i8*, i8*)* @objc_msg_lookup(i8* bitcast (i64* @_OBJC_CLASS_Test0 to i8*),
 // CHECK-NEXT: [[T1:%.*]] = bitcast i8* (i8*, i8*, ...)* [[T0]] to void (i8*, i8*)*
 // CHECK-NEXT: call void [[T1]](i8* bitcast (i64* @_OBJC_CLASS_Test0 to i8*),