Advertize support for constexpr.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150524 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Lexer/has_feature_cxx0x.cpp b/test/Lexer/has_feature_cxx0x.cpp
index f02f103..17ed6fb 100644
--- a/test/Lexer/has_feature_cxx0x.cpp
+++ b/test/Lexer/has_feature_cxx0x.cpp
@@ -217,3 +217,12 @@
 
 // CHECK-0X: has_unicode_literals
 // CHECK-NO-0X: no_unicode_literals
+
+#if __has_feature(cxx_constexpr)
+int has_constexpr();
+#else
+int no_constexpr();
+#endif
+
+// CHECK-0X: has_constexpr
+// CHECK-NO-0X: no_constexpr