1963323 - Fix metadata handling of Wasm GC objects

Status: NEW

(Core :: JavaScript: WebAssembly, task)

Description

[Jan de Mooij [:jandem]]

This is caught by the assertion I'm adding in bug 1963320. I'll ignore these Wasm GC objects there for now, but we should fix this and remove the special-case there.

The issue is that WasmArrayObject::class_ and the WasmStructObject classes have JSCLASS_DELAY_METADATA_BUILDER but they don't use AutoSetNewObjectMetadata.

We should probably also add some tests (using enableShellAllocationMetadataBuilder and getAllocationMetadata).