Performance and stability improvements on all platforms.

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

Change-Id: I4b2511b641867a0bdf1515fc2dc8a82e149ef2a4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1567876
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.270@{#1}
Cr-Branched-From: 4dd01774c63e9d8a896dcddccb23b964e0c160e0-refs/heads/master@{#60851}