Performance and stability improvements on all platforms.

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

Change-Id: Ice9b4b03b14bed7532a92807e18699bbe3484d85
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1561290
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.238@{#1}
Cr-Branched-From: 565bf1308ce66254d16a2fdb67b525e3b337a9a4-refs/heads/master@{#60741}