Performance and stability improvements on all platforms.

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

Change-Id: If4fffd1516b9f6b36d7d069d0da7f24009bc80aa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1503559
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.4.287@{#1}
Cr-Branched-From: 8c9b8127f2023f9775efba0f742e2040d2ef13a1-refs/heads/master@{#60038}