Performance and stability improvements on all platforms.

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

Change-Id: I0cca0dc1c522a9d6f592ac46bad5d50953745c5f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1535701
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.91@{#1}
Cr-Branched-From: bfbf8cccf44d52de63f439e876277168e6e172bd-refs/heads/master@{#60405}