This is a reland of faf2208a0b
Changes since revert:
- Fix arm64 codegen for full pointer mode
Original change's description:
> [compiler] Support acq/rel accesses and atomic accesses on tagged
>
> This CL adds an AtomicMemoryOrder parameter to the various atomic load
> and store operators. Currently only acquire release (kAcqRel) and
> sequentially consistent (kSeqCst) orders are supported.
>
> Additionally, atomic loads and stores are extended to work with tagged
> values.
>
> This CL is a pre-requisite for supporting atomic accesses in Torque,
> which is in turn a pre-requisite for prototyping shared strings.
>
> Bug: v8:11995
> Change-Id: Ic77d2640e2dc7e5581b1211a054c93210c219355
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3101765
> Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
> Reviewed-by: Zhi An Ng <zhin@chromium.org>
> Commit-Queue: Shu-yu Guo <syg@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#76393}
Bug: v8:11995
Change-Id: I23577486334fec6b08fb3a2f5be1f6e5e16db11b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3107220
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76399}
6a487504ed