Performance and stability improvements on all platforms.

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

Change-Id: I6ad8096ec086600c5e5c2fbf5dcaf681736052a3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1503558
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.4.286@{#1}
Cr-Branched-From: e4bff229b2d312b94ce8cd4299ad2bb49ac119db-refs/heads/master@{#60034}