Performance and stability improvements on all platforms.

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

Change-Id: I85916174e0af548a5e30b1f313df2bca3b570b5b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1565176
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.265@{#1}
Cr-Branched-From: f7afe0087e2f6b846e28d5526ed7cb6e340c2ec8-refs/heads/master@{#60810}