Performance and stability improvements on all platforms.

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

Change-Id: Iaa545d2d75c71eaa9fb2bb629c4f8d2cd45463ea
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1553005
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.193@{#1}
Cr-Branched-From: 1646dbe05df6179e408c1b4603d33922b9cb1f5f-refs/heads/master@{#60636}