Fix #13249 FP syntaxError with sizeof in enum (danmar#6941)

Author: chrchr-github

lib/tokenize.cpp

@@ -8619,6 +8619,10 @@ void Tokenizer::findGarbageCode() const
                 syntaxError(tok->tokAt(2), "Unexpected token '" + tok->strAt(2) + "'");
             if (const Token* start = SymbolDatabase::isEnumDefinition(tok)) {
                 for (const Token* tok2 = start->next(); tok2 && tok2 != start->link(); tok2 = tok2->next()) {
+                    if (Token::simpleMatch(tok2, "sizeof (")) {
+                        tok2 = tok2->linkAt(1);
+                        continue;
+                    }
                     if (tok2->str() == ";")
                         syntaxError(tok2);
                 }

test/testtokenize.cpp

@@ -7216,6 +7216,8 @@ class TestTokenizer : public TestFixture {
         ASSERT_NO_THROW(tokenizeAndStringify("class A { bool restrict() const; };\n"
                                              "bool A::restrict() const { return true; }")); // #12718
 
+        ASSERT_NO_THROW(tokenizeAndStringify("enum { E = sizeof(struct { int i; }) };")); // #13249
+
         ignore_errout();
     }