[Webkit-unassigned] [Bug 190047] New: [JSC] Optimize Object.keys by caching own keys results in StructureRareData

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190047

            Bug ID: 190047
           Summary: [JSC] Optimize Object.keys by caching own keys results
                    in StructureRareData
           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: yusukesuzuki at slowstart.org

Let's cache the own keys in StructureRareData and reuse it to optimize Object.keys.
We will put JSImmutableButterfly in StructureRareData. And Object.keys will generate JSArray wrapping it!

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