Adds new `br_on_cast_fail null <branch depth> <heap type>` instruction
with opcode 0xfb4b.
The heap type may be any concreate heap type index or an abstract
type like `(ref null eq)`.
Bug: v8:7748
Change-Id: Ieb7322a31fd2b5f64a669193003a365149bef34e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4085008
Reviewed-by: Manos Koukoutos <manoskouk@chromium.org>
Commit-Queue: Matthias Liedtke <mliedtke@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/main@{#84868}
89f05508b1