[NFC][Clang][Pragma] Remove unused variables

[beanz]

LGTM

clang/lib/Lex/Pragma.cpp

void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
     // to handle a _Pragma differently.
   }
 };
 
 /// This handles parsing pragmas that take a macro name and optional message
 static IdentifierInfo *HandleMacroAnnotationPragma(Preprocessor &PP, Token &Tok,
                                                    const char *Pragma,
                                                    std::string &MessageString) {
-  std::string Macro;
-
   PP.Lex(Tok);
   if (Tok.isNot(tok::l_paren)) {
     PP.Diag(Tok, diag::err_expected) << "(";
     return nullptr;
   }
 
   PP.LexUnexpandedToken(Tok);
   if (!Tok.is(tok::identifier)) {

 /// \code
 ///   #pragma clang final(MACRO_NAME)
 /// \endcode
 struct PragmaFinalHandler : public PragmaHandler {
   PragmaFinalHandler() : PragmaHandler("final") {}
 
   void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                     Token &Tok) override {
-    std::string Macro;
-
     PP.Lex(Tok);
     if (Tok.isNot(tok::l_paren)) {
       PP.Diag(Tok, diag::err_expected) << "(";
       return;
     }
 
     PP.LexUnexpandedToken(Tok);
     if (!Tok.is(tok::identifier)) {