[Webkit-unassigned] [Bug 143734] New: MovHint should be a strong use

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=143734

            Bug ID: 143734
           Summary: MovHint should be a strong use
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

Currently MovHint is a "weak" use in the sense that if nothing else uses a child of a MovHint then the MovHint turns into a ZombieHint.  We should change this.  Instead, MovHint should be a strong use.  This will fix bugs where our other mechanisms of keeping things alive for OSR (i.e. Phantoms) aren't properly preserved.

This will reduce the amount of DCE we do.  As part of this patch, we should mitigate the reduction in DCE by introducing a phase that removes MovHints if the value is dead in bytecode.

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