Performance and stability improvements on all platforms.

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

Change-Id: Ic4087f6e53a66de77d4786167b424fc8d057a55c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1560223
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.227@{#1}
Cr-Branched-From: cb9896562dca2ab96687d3001d8992652cafcb70-refs/heads/master@{#60724}