Performance and stability improvements on all platforms.

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

Change-Id: I5f05614e20de27f8ce147c6f2ba89d7343965b5f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1547423
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.156@{#1}
Cr-Branched-From: be470c554698bd0e7173df8cf237606aeb2dde50-refs/heads/master@{#60558}