[Webkit-unassigned] [Bug 148331] New: DFG::PutStackSinkingPhase doesn't need to emit KillStack nodes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=148331

            Bug ID: 148331
           Summary: DFG::PutStackSinkingPhase doesn't need to emit
                    KillStack nodes
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

PutStackSinkingPhase currently emits KillStack nodes when it sinks a PutStack. This isn't necessary because KillStack is only interesting for OSR exit, and PutStack nodes that are relevant to OSR will already be preceded by a KillStack/MovHint pair.

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