[Webkit-unassigned] [Bug 266043] New: [Wasm-GC] Fix missing write barrier in BBQJIT struct.set

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=266043

            Bug ID: 266043
           Summary: [Wasm-GC] Fix missing write barrier in BBQJIT
                    struct.set
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebAssembly
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: asumu at igalia.com

The following test crashes in the BBQJIT tier:

```
//@ runWebAssemblySuite("--useWebAssemblyTypedFunctionReferences=true", "--useWebAssemblyGC=true")

import * as assert from "../assert.js";
import { compile, instantiate } from "./wast-wrapper.js";

const m1 = instantiate(`
  (module
    (type (struct (field i32)))
    (type (struct (field (mut (ref null 0)))))
    (func (export "f") (result (ref any))
      (struct.new 1 (ref.null 0)))
  )
`);

const struct = m1.exports.f()
gc();

const m2 = instantiate(`
  (module
    (type (struct (field i32)))
    (type (struct (field (mut (ref null 0)))))
    (func (export "g") (param (ref 1))
      (struct.set 1 0 (local.get 0) (struct.new 0 (i32.const 42))))
    (func (export "h") (param (ref 1)) (result i32)
      (struct.get 0 0 (struct.get 1 0 (local.get 0))))
  )
`);

m2.exports.g(struct);
edenGC();
assert.equals(m2.exports.h(struct), 42);
```
This is due to a missing write barrier, ensuring that the old object from module m1 has a reference to a new object in module m2 that will be traced.

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