Performance and stability improvements on all platforms.

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

Change-Id: Id3f8db5b99e57d7bb7df8c2fb7b537a528def85a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1542235
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.131@{#1}
Cr-Branched-From: 519bf695b2a968870abfdb99012d532212ae1920-refs/heads/master@{#60500}