message: Fix -Wswitch warning after r330790.
  source/Symbol/ClangASTContext.cpp:391:13: error: enumeration value 'HIP' not handled in switch [-Werror,-Wswitch]
  switch (IK.getLanguage()) {
diff: @@ -408,6 +408,9 @@ static void ParseLangArgs(LangOptions &Opts, InputKind IK, const char *triple) {
  case InputKind::ObjCXX:
  LangStd = LangStandard::lang_gnucxx98;
  break;
  + case InputKind::HIP:
  + LangStd = LangStandard::lang_hip;
  + break;
  }
  }
  