Performance and stability improvements on all platforms.

TBR=v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com

Change-Id: I2b0e4827818fb450c826be2638facdd82e476cd7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1544787
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.141@{#1}
Cr-Branched-From: 1ec7ffedc85a1868a25b758147d8acc0c398bd72-refs/heads/master@{#60517}