[Webkit-unassigned] [Bug 164581] New: [JSC] op_in should have ArrayProfile

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164581

            Bug ID: 164581
           Summary: [JSC] op_in should have ArrayProfile
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: utatane.tea at gmail.com

Much time is taken in Array.prototype.map in ES6SampleBench/Basic.
And sampling profiler tells us that op_in is one of the hottest bytecode.
We have a path optimizing `"string" in obj` case, but we always fall into the slow generic code for `index in array` case.

We should have array profile and handle op_in like GetByVal thing.

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