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

llvm-svn: 188447
diff --git a/clang/test/CodeGenCXX/default-arguments.cpp b/clang/test/CodeGenCXX/default-arguments.cpp
index 206d4d6..83cae3a 100644
--- a/clang/test/CodeGenCXX/default-arguments.cpp
+++ b/clang/test/CodeGenCXX/default-arguments.cpp
@@ -26,7 +26,7 @@
  B(const A1& = A1(), const A2& = A2());
 };
 
-// CHECK: define void @_Z2f1v()
+// CHECK-LABEL: define void @_Z2f1v()
 void f1() {
 
  // CHECK: call void @_ZN2A1C1Ev(
@@ -42,10 +42,10 @@
  C();
 };
 
-// CHECK: define void @_ZN1CC1Ev(%struct.C* %this) unnamed_addr
+// CHECK-LABEL: define void @_ZN1CC1Ev(%struct.C* %this) unnamed_addr
 // CHECK: call void @_ZN1CC2Ev(
 
-// CHECK: define void @_ZN1CC2Ev(%struct.C* %this) unnamed_addr
+// CHECK-LABEL: define void @_ZN1CC2Ev(%struct.C* %this) unnamed_addr
 // CHECK: call void @_ZN2A1C1Ev(
 // CHECK: call void @_ZN2A2C1Ev(
 // CHECK: call void @_ZN1BC1ERK2A1RK2A2(
@@ -53,7 +53,7 @@
 // CHECK: call void @_ZN2A1D1Ev
 C::C() { }
 
-// CHECK: define void @_Z2f3v()
+// CHECK-LABEL: define void @_Z2f3v()
 void f3() {
  // CHECK: call void @_ZN2A1C1Ev(
  // CHECK: call void @_ZN2A2C1Ev(