only call Token::originalName() if necessary (danmar#7357)

this was causing `Token::mOriginalName` to be allocated for each `Token`
even if it is empty.

Author: firewave

lib/token.cpp

@@ -1046,7 +1046,8 @@ Token* Token::insertToken(const std::string& tokenStr, const std::string& origin
     else
         newToken = new Token(mTokensFrontBack);
     newToken->str(tokenStr);
-    newToken->originalName(originalNameStr);
+    if (!originalNameStr.empty())
+        newToken->originalName(originalNameStr);
     newToken->setMacroName(macroNameStr);
 
     if (newToken != this) {

lib/tokenlist.cpp

@@ -253,7 +253,8 @@ void TokenList::addtoken(const Token *tok)
         mTokensFrontBack.front = new Token(mTokensFrontBack);
         mTokensFrontBack.back = mTokensFrontBack.front;
         mTokensFrontBack.back->str(tok->str());
-        mTokensFrontBack.back->originalName(tok->originalName());
+        if (!tok->originalName().empty())
+            mTokensFrontBack.back->originalName(tok->originalName());
         mTokensFrontBack.back->setMacroName(tok->getMacroName());
     }