[Webkit-unassigned] [Bug 233444] New: [WASM-Function-References] Simplify representation of Wasm Type

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=233444

            Bug ID: 233444
           Summary: [WASM-Function-References] Simplify representation of
                    Wasm Type
           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 Type has weird ballast called signature index, actually there is no such field in the wasm spec - https://github.com/WebAssembly/function-references/blob/master/proposals/function-references/Overview.md.
Signature index was introduced to implement `call_ref` instruction because there wasn't an ability to get Signature from the obtained type.
In this bug this ability is introduced and we can simplify Type to the form <kind, nullability, typeIndex>, where typeIndex is an index in Wasm Type section.
This will simplify subsequent work for new Wasm types like struct or arrays.

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