[Webkit-unassigned] [Bug 243208] New: [WASM-GC] Add support for struct.new, struct.get and struct.set

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243208

            Bug ID: 243208
           Summary: [WASM-GC] Add support for struct.new, struct.get and
                    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: dbezhetskov at igalia.com

Wasm GC proposal introduces structs (https://github.com/WebAssembly/gc/blob/main/proposals/gc/MVP.md#structures)
To enhance support of Wasm GC proposal in JSC this patch supports struct.new, struct.get and struct.set operations. These operations have been chosen because it is convenient to test it together and hard to test it separately.
Current implementation isn't optimal, at least for B3 and Air tiers, but optimization (replacing runtime call to a load by known offset) for struct.get/set could be easily added as a next step.

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