Enable removing unreferenced labels for non-dbg as well
Enable removing unreferenced labels for non-dbg as well

If the unreference label had a region, we will end up doing a lot of work in lowerer to generate returnthunks etc

Fixes OS#17415331

Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore