[clang] Remove unused member variable from ModuleMap

This became unused when module map parsing moved to ModuleMapFile.cpp.

Author: Bigcheese

clang/include/clang/Lex/ModuleMap.h

@@ -84,11 +84,6 @@ class ModuleMap {
   /// such as "stdint.h".
   OptionalDirectoryEntryRef BuiltinIncludeDir;
 
-  /// Language options used to parse the module map itself.
-  ///
-  /// These are always simple C language options.
-  LangOptions MMapLangOpts;
-
   /// The module that the main source file is associated with (the module
   /// named LangOpts::CurrentModule, if we've loaded it).
   Module *SourceModule = nullptr;

clang/lib/Lex/ModuleMap.cpp

@@ -354,7 +354,6 @@ ModuleMap::ModuleMap(SourceManager &SourceMgr, DiagnosticsEngine &Diags,
                      HeaderSearch &HeaderInfo)
     : SourceMgr(SourceMgr), Diags(Diags), LangOpts(LangOpts), Target(Target),
       HeaderInfo(HeaderInfo) {
-  MMapLangOpts.LineComment = true;
 }
 
 ModuleMap::~ModuleMap() = default;