[libclang] Fix CIndexer::isOptEnabled(); not sure what I was thinking there.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153594 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndexer.h b/tools/libclang/CIndexer.h
index c8c48e9..8a249f0 100644
--- a/tools/libclang/CIndexer.h
+++ b/tools/libclang/CIndexer.h
@@ -53,7 +53,7 @@
   void setCXGlobalOptFlags(unsigned options) { Options = options; }
 
   bool isOptEnabled(CXGlobalOptFlags opt) const {
-    return Options & ~unsigned(opt);
+    return Options & opt;
   }
 
   /// \brief Get the path of the clang resource files.