[Webkit-unassigned] [Bug 147133] New: Add availability for InternalFunction to have JS implementation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=147133

            Bug ID: 147133
           Summary: Add availability for InternalFunction to have JS
                    implementation
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (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

Current Promise constructor is implemented as an InternalFunction which has C++ implementations.
But almost all processes are done in JS builtin's @initializePromise function.
And after issue 147051 is landed, we can write the whole Promise constructor code in JS.

I suggest enabling InternalFunction to have JS function implementation instead of just replacing Promise constructor with a Promise builtin JS function object because if we replace the current Promise constructor with the JS function simply, we cannot leverage the getStaticFunctionSlot (& its system for materializing builtin functions lazily)

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