Performance and stability improvements on all platforms.

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

Change-Id: If9cda7ddcf9eb593a52ffe7d9dfc89892985d8a1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1683117
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.7.168@{#1}
Cr-Branched-From: 364ce91e9d8638016564b066b37ab52e2a7b0b86-refs/heads/master@{#62465}