Removed misplaced //fixme comment that doesn't belong there.

Noticed by Darin

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@38178 268f45cc-cd09-0410-ab3c-d52691b4dbfc

JavaScriptCore/runtime/Collector.cpp

@@ -454,7 +454,6 @@ static inline void* currentThreadStackBase()
         thread.StackInfo(info);
         stackBase = (void*)info.iBase;
     }
-    //fixme
     return (void*)stackBase;
 #else
 #error Need a way to get the stack base on this platform