message: Fix spell for clang < 7
diff: @@ -569,17 +569,20 @@ public:
  const FileEntry *FE;
  Range loc;
  #if LLVM_VERSION_MAJOR < 7
  + CharSourceRange R;
  + if (SM.isMacroArgExpansion(Loc))
  + R = CharSourceRange::getTokenRange(Spell);
  + else {
  auto P = SM.getExpansionRange(Loc);
  - loc = FromCharRange(SM, Ctx->getLangOpts(), SourceRange(P.first, P.second));
  - LocFID = SM.getFileID(P.first);
  - FE = SM.getFileEntryForID(LocFID);
  + R = CharSourceRange::getTokenRange(P.first, P.second);
  + }
  #else
  auto R = SM.isMacroArgExpansion(Loc) ? CharSourceRange::getTokenRange(Spell)
  : SM.getExpansionRange(Loc);
  +#endif
  loc = FromTokenRange(SM, Lang, R.getAsRange());
  LocFID = SM.getFileID(R.getBegin());
  FE = SM.getFileEntryForID(LocFID);
  -#endif
  if (!FE)
  return true;
  IndexFile *db = param.ConsumeFile(*FE);
  