[Webkit-unassigned] [Bug 172455] New: FTL stack overflow handling should not assume that B3 never selects callee-saves in the prologue

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172455

            Bug ID: 172455
           Summary: FTL stack overflow handling should not assume that B3
                    never selects callee-saves in the prologue
           Product: WebKit
           Version: WebKit 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

In one bizarre case, B3 used a callee-save for the CodeBlock constant created in the prologue before the stack overflow check.

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