[PP] Remove another unused parameter

include/clang/Lex/Preprocessor.h

 public:
   void HandlePragmaOnce(Token &OnceTok);
   void HandlePragmaMark();
-  void HandlePragmaPoison(Token &PoisonTok);
+  void HandlePragmaPoison();
   void HandlePragmaSystemHeader(Token &SysHeaderTok);
   void HandlePragmaDependency(Token &DependencyTok);
   void HandlePragmaPushMacro(Token &Tok);

lib/Lex/Pragma.cpp

 
 /// HandlePragmaPoison - Handle \#pragma GCC poison.  PoisonTok is the 'poison'.
 ///
-void Preprocessor::HandlePragmaPoison(Token &PoisonTok) {
+void Preprocessor::HandlePragmaPoison() {
   Token Tok;
 
   while (true) {

 
   void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
                     Token &PoisonTok) override {
-    PP.HandlePragmaPoison(PoisonTok);
+    PP.HandlePragmaPoison();
   }
 };