Improve performance of Symbol marking
Improve performance of Symbol marking

scala/scala,martijnhoekstra/scala,martijnhoekstra/scala,shimib/scala,lrytz/scala,martijnhoekstra/scala,martijnhoekstra/scala,martijnhoekstra/scala,scala/scala,shimib/scala,shimib/scala,scala/scala,martijnhoekstra/scala,scala/scala,lrytz/scala,lrytz/scala,lrytz/scala,scala/scala,lrytz/scala,shimib/scala,lrytz/scala,shimib/scala,shimib/scala,scala/scala