Bug 155590

Summary: The concat fast path should use "in" instead of a getbyid === undefined
Product: WebKit Reporter: Keith Miller <keith_miller>
Component: JavaScriptCoreAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal    
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   

Description Keith Miller 2016-03-17 11:32:11 PDT 
We use getbyid === undefined because switch to in is a 10% regression on the stanford-crypto tests. We should notice in the DFG that an in on an id is a constant and fold it.