Performance and stability improvements on all platforms.

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

Change-Id: I079732eaa2bd9fe5b2ff3d99e5cedac4a37ecee6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547420
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.151@{#1}
Cr-Branched-From: b3b7011867cf2f2d50a509b03e39c54fe0e213e0-refs/heads/master@{#60542}