When lexing in C11 mode, accept unicode character and string literals, per C11
6.4.4.4/1 and 6.4.5/1.

llvm-svn: 176780
diff --git a/clang/test/Lexer/utf8-char-literal.cpp b/clang/test/Lexer/utf8-char-literal.cpp
index 12b001e..7a4d126 100644
--- a/clang/test/Lexer/utf8-char-literal.cpp
+++ b/clang/test/Lexer/utf8-char-literal.cpp
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c++11 -fsyntax-only -verify %s
+// RUN: %clang_cc1 -triple x86_64-apple-darwin -std=c11 -x c -fsyntax-only -verify %s
 
 int array0[u'ñ' == u'\xf1'? 1 : -1];
 int array1['\xF1' !=  u'\xf1'? 1 : -1];