This is a reland of commit 20327d1599
Changed in reland:
- Added new flag wasm-gc-structref-as-dataref which defaults to true
and preserves the existing behavior.
- Passing --no-wasm-gc-structref-as-dataref enables the new behavior.
- The flag affects static subtyping information between structref and
arrays and the corresponding cast, test and br_on instructions.
- Even with the old behavior the name still changed to "structref".
Original change's description:
> [wasm-gc] Ref types: Convert dataref to structref
>
> This change changes the type hierarchy in a non-backwards compatible
> way: dataref is replaced with structref meaning that arrayref is
> no longer a subtype of it.
>
> Bug: v8:7748
> Change-Id: I965267d9ed11ea7c7d7df133cc39ee63e6b5abc3
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3929041
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Commit-Queue: Matthias Liedtke <mliedtke@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#83515}
Bug: v8:7748
Change-Id: I2d8dd49dbc56246c087ac93452a87f860ead2195
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3945109
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Matthias Liedtke <mliedtke@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83697}
3b883e787d