[Webkit-unassigned] [Bug 186460] New: [DFG][FTL] Spread onto PhantomNewArrayBuffer assumes JSFixedArray, but JSImmutableButterfly is returned

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186460

            Bug ID: 186460
           Summary: [DFG][FTL] Spread onto PhantomNewArrayBuffer assumes
                    JSFixedArray, but JSImmutableButterfly is returned
           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

Spread for phantom nodes generates JSFixedArray. So previously, our PhantomNewArrayBuffer returns a fixed array stored in this node. But now, it holds JSImmutableButterfly, but FTL lowering phase mixes JSFixedArray and JSImmutableButterfly.

I think we can generate JSImmutableButterfly instead of JSFixedArray in Spread.

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