Fix #13712 fuzzing crash (stack overflow) in Token::typeDecl() (danmar#8108)

Co-authored-by: chrchr-github <noreply@github.com>

Author: chrchr-github

lib/tokenize.cpp

@@ -8943,6 +8943,8 @@ void Tokenizer::findGarbageCode() const
             syntaxError(tok->next());
         if (Token::Match(tok, "%name% %op% %name%") && !tok->isKeyword() && tok->next()->isIncDecOp())
             syntaxError(tok->next());
+        if (!tok->isKeyword() && Token::Match(tok, "%name% .|-> %name% %name%") && !tok->tokAt(2)->isKeyword())
+            syntaxError(tok);
         if (Token::Match(tok, "[!|+-/%^~] )|]"))
             syntaxError(tok);
         if (Token::Match(tok, "==|!=|<=|>= %comp%") && tok->strAt(-1) != "operator")

test/cli/fuzz-crash/crash-4ad024d4f64dfd58d73a3296173fe13860fb8b70

@@ -0,0 +1 @@
+n f(){auto x=i->o x}