Performance and stability improvements on all platforms.

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

Change-Id: Id6588d0cb6f129689c351ceef276ab21e306eda5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1501976
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.4.280@{#1}
Cr-Branched-From: b71325230db82f4d43a3cefa5a64b8253e5591e0-refs/heads/master@{#60022}