[Webkit-unassigned] [Bug 180852] New: The CleanUp phase (after the IntegerRangeOptimization phase) is erroneously removing a Check.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180852

            Bug ID: 180852
           Summary: The CleanUp phase (after the IntegerRangeOptimization
                    phase) is erroneously removing a Check.
           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: mark.lam at apple.com

Created attachment 329425

  --> https://bugs.webkit.org/attachment.cgi?id=329425&action=review

Repro test case.

This results in a subsequent node expecting a checked String object, but instead, got a non-String cell, which leads to a crash.

I ran the test as follows:
$ JSC_useConcurrentJIT=0 jsc repro1.js

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