[Webkit-unassigned] [Bug 239493] New: [WASM-GC] Introduce rtt types

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239493

            Bug ID: 239493
           Summary: [WASM-GC] Introduce rtt types
           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

Though rtt types currently not actively used they are still required in Wasm GC MVP: https://github.com/WebAssembly/gc/blob/main/proposals/gc/MVP.md.

Particularly, they are needed for struct.new* instructions, but struct constructors can avoid rtts usage.

Because of all that rtt prototype support should be added in JSC to move forward with struct types.

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