arrange for -Wno-error=foo warnings to be immune to -Werror as 
they are supposed to be.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@69265 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/clang-cc/Warnings.cpp b/tools/clang-cc/Warnings.cpp
index ccaa653..818e774 100644
--- a/tools/clang-cc/Warnings.cpp
+++ b/tools/clang-cc/Warnings.cpp
@@ -138,7 +138,7 @@
       }
       
       // -Werror=foo maps foo to Error, -Wno-error=foo maps it to Warning.
-      Mapping = isPositive ? diag::MAP_ERROR : diag::MAP_WARNING;
+      Mapping = isPositive ? diag::MAP_ERROR : diag::MAP_WARNING_NO_WERROR;
       OptStart = Specifier;
     }