Switch diagnostic text from "C++0x" over to "C++11".

We'd also like for "C++11" or "c++11" to be used for the warning
groups, but without removing the old warning flags. Patches welcome;
I've run out of time to work on this today.

llvm-svn: 141801
diff --git a/clang/test/SemaCXX/convert-to-bool.cpp b/clang/test/SemaCXX/convert-to-bool.cpp
index 4cd22e9..c9a3555 100644
--- a/clang/test/SemaCXX/convert-to-bool.cpp
+++ b/clang/test/SemaCXX/convert-to-bool.cpp
@@ -8,7 +8,7 @@
 };
 
 struct ExplicitConvToBool {
-  explicit operator bool(); // expected-warning{{explicit conversion functions are a C++0x extension}}
+  explicit operator bool(); // expected-warning{{explicit conversion functions are a C++11 extension}}
 };
 
 void test_conv_to_bool(ConvToBool ctb, ConvToInt cti, ExplicitConvToBool ecb) {
@@ -39,7 +39,7 @@
 void accepts_bool(bool) { } // expected-note{{candidate function}}
 
 struct ExplicitConvToRef {
-  explicit operator int&(); // expected-warning{{explicit conversion functions are a C++0x extension}}
+  explicit operator int&(); // expected-warning{{explicit conversion functions are a C++11 extension}}
 };
 
 void test_explicit_bool(ExplicitConvToBool ecb) {
@@ -56,7 +56,7 @@
 struct A { };
 struct B { };
 struct C {
-  explicit operator A&(); // expected-warning{{explicit conversion functions are a C++0x extension}}
+  explicit operator A&(); // expected-warning{{explicit conversion functions are a C++11 extension}}
   operator B&(); // expected-note{{candidate}}
 };