Add -fsanitize=integer for reporting suspicious integer behaviors.

Introduces new sanitizer "unsigned-integer-overflow".


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@168701 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/SanitizerArgs.h b/lib/Driver/SanitizerArgs.h
index 85f81f4..ffc1493 100644
--- a/lib/Driver/SanitizerArgs.h
+++ b/lib/Driver/SanitizerArgs.h
@@ -30,7 +30,7 @@
 #include "clang/Basic/Sanitizers.def"
     NeedsAsanRt = Address,
     NeedsTsanRt = Thread,
-    NeedsUbsanRt = Undefined ^ Bounds
+    NeedsUbsanRt = (Undefined & ~Bounds) | Integer
   };
   unsigned Kind;