Performance and stability improvements on all platforms.

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

Change-Id: Id99c13424932d1ee7b79d20407d7b2978114b1d8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1557342
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.212@{#1}
Cr-Branched-From: 3e14c177912939faea668810124d0298bd93a8fe-refs/heads/master@{#60670}