Roll V8 from 746878b001db to bc56dafb2ce1 (4 revisions)

https://chromium.googlesource.com/v8/v8.git/+log/746878b001db..bc56dafb2ce1

2023-10-18 v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com Version 12.0.140
2023-10-18 mfarazma@redhat.com PPC: merge Simd replace_lane opcodes
2023-10-18 dinfuehr@chromium.org [heap] Move SemiSpaceNewSpace LAB-related methods into MainAllocator
2023-10-18 dinfuehr@chromium.org [heap] Remove allocator access in PagedSpaceForNewSpace::Available()

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/v8-chromium-autoroll
Please CC liviurau@google.com,machenbach@google.com,v8-waterfall-sheriff@grotations.appspotmail.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Cq-Include-Trybots: luci.chromium.try:linux-blink-rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel;luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:dawn-linux-x64-deps-rel
Change-Id: I3922fe6ba4f7580823cb6120c804538f2d2d3953
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4954057
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1211924}