[Webkit-unassigned] [Bug 258845] New: Fix checkSwitchToJITForLoop on ARM64E to work with --returnEarlyFromInfiniteLoopsForFuzzing=1 --useJIT=0.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258845

            Bug ID: 258845
           Summary: Fix checkSwitchToJITForLoop on ARM64E to work with
                    --returnEarlyFromInfiniteLoopsForFuzzing=1 --useJIT=0.
           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

On ARM64E, checkSwitchToJITForLoop() assumes that we can always dispatch thru g_jscConfig.llint.gateMap[Gate::loopOSREntry], which is normally a JIT thunk.  However, this entry is null when --useJIT=0.  Fix this by implementing a LLInt only thunk that achieves the same thing.

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