Performance and stability improvements on all platforms.

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

Change-Id: If041da9535579ceba4d277db1769692a5bc0c789
Reviewed-on: https://chromium-review.googlesource.com/c/1363033
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.3.31@{#1}
Cr-Branched-From: f3552af7fce31f91e7261502cdb7ad53912b58be-refs/heads/master@{#58039}