Add -Wstring-plus-int, which warns on "str" + int and int + "str".

It doesn't warn if the integer is known at compile time and within
the bounds of the string.

Discussion: http://comments.gmane.org/gmane.comp.compilers.clang.scm/47203



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151943 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaCXX/constant-expression-cxx11.cpp b/test/SemaCXX/constant-expression-cxx11.cpp
index dcc437a..66fd064 100644
--- a/test/SemaCXX/constant-expression-cxx11.cpp
+++ b/test/SemaCXX/constant-expression-cxx11.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -triple i686-linux -fsyntax-only -verify -std=c++11 -pedantic %s -Wno-comment
+// RUN: %clang_cc1 -triple i686-linux -Wno-string-plus-int -fsyntax-only -verify -std=c++11 -pedantic %s -Wno-comment
 
 namespace StaticAssertFoldTest {