[Webkit-unassigned] [Bug 251874] New: [Wasm-GC] Update element segments to account for typed funcrefs and GC types

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251874

            Bug ID: 251874
           Summary: [Wasm-GC] Update element segments to account for typed
                    funcrefs and GC types
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebAssembly
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tjc at igalia.com

The following test:

```
function testElem() {
    let m = instantiate(`  
        (module
            (type $bvec (array i8))
            (elem $e (ref $bvec)
              (array.new_canon $bvec (i32.const 7) (i32.const 3))))`);
}
```

fails with:

```
Exception: CompileError: WebAssembly.Module doesn't parse at byte 30: opcode for exp in element section's should be either ref.func or ref.null 0th element's 0th index (evaluating 'new WebAssembly.Module(binary)')
```

This is because `SectionParser::parseElementSegmentVectorOfExpressions()` requires the members of the elements vector to be either a `RefFunc` or `RefNull`.

The test should compile (this is taken from https://github.com/WebAssembly/gc/blob/main/test/core/gc/array.wast#L203 )

A related bug is https://bugs.webkit.org/show_bug.cgi?id=251041 , but that one covers tables rather than element segments.

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