Change Preprocessor to keep a copy of LangOptions instead of reference, like ASTContext.

Now when creating a Preprocessor we can pass it a temporary LangOptions object instead of having to remember to keep it around.

llvm-svn: 76815

clang/include/clang/Lex/Preprocessor.h

@@ -49,7 +49,7 @@ class DirectoryLookup;
 ///
 class Preprocessor {
   Diagnostic        *Diags;
-  const LangOptions &Features;
+  LangOptions        Features;
   TargetInfo        &Target;
   FileManager       &FileMgr;
   SourceManager     &SourceMgr;