[wasm-gc] Introduce function null type nofunc
nofunc is the abstract null type, the equivalent of none but for the function type hierarchy. none and nofunc (and later on noextern) all can only represent a null value, however their nulls are distinct (as there isn't any subtype relationship between them). Bug: v8:7748 Change-Id: Ic5ae502cc21a581ca2e0f5abc46139435d950af9 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3805884Reviewed-by:Jakob Kummerow <jkummerow@chromium.org> Commit-Queue: Matthias Liedtke <mliedtke@chromium.org> Cr-Commit-Position: refs/heads/main@{#82274}
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