[wasm-gc] Support RTTs of generic types ("eqref" etc)
By introducing a globally known map for each generic type. These maps are never used to allocate objects, they only serve as sentinels for generic heap types. Bug: v8:7748 Change-Id: I950a8c712dc1510759a833fe9122b9e9a6222dc2 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2288860 Commit-Queue: Jakob Kummerow <jkummerow@chromium.org> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Reviewed-by: Clemens Backes <clemensb@chromium.org> Cr-Commit-Position: refs/heads/master@{#68755}
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