[Webkit-unassigned] [Bug 184830] New: Webkit nightly crashes when trying to execute WebAssembly code with JSC

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=184830

            Bug ID: 184830
           Summary: Webkit nightly crashes when trying to execute
                    WebAssembly code with JSC
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebAssembly
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rokumper at microsoft.com

Using nightly build v230841 through jsvu.

When I try to run mono's regression suite with jsc, it aborts early on.

Running under LLDB I get a really weird backtrace:

```
* thread #1, stop reason = signal SIGABRT
  * frame #0: 0x000000010007a216 dyld`__abort_with_payload + 10
    frame #1: 0x0000000100079b88 dyld`abort_with_payload_wrapper_internal + 89
    frame #2: 0x0000000100079bb5 dyld`abort_with_payload + 9
    frame #3: 0x000000010004d482 dyld`dyld::halt(char const*) + 354
    frame #4: 0x0000000100050533 dyld`dyld::_main(macho_header const*, unsigned long, int, char const**, char const**, char const**, unsigned long*) + 8004
    frame #5: 0x000000010004a3d4 dyld`dyldbootstrap::start(macho_header const*, int, char const**, long, macho_header const*, unsigned long*) + 453
    frame #6: 0x000000010004a1d2 dyld`_dyld_start + 54
```

How to reproduce: Follow the instructions on https://github.com/mono/mono/blob/master/sdks/wasm/README.md and run `make run-jsc-mini`.
I can provide a zip with all the required files if so desired.

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