Performance and stability improvements on all platforms.

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

Change-Id: I9c8ebfd25f7c88aea3f9faffe08ba110bcff0dd2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1557344
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.213@{#1}
Cr-Branched-From: c6574e4a9387a3fc88b26da041bbe3691850328a-refs/heads/master@{#60671}