Performance and stability improvements on all platforms.

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

Change-Id: Icb2394509b12a5a3f6a001ee2f558223a421cb75
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1556583
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.211@{#1}
Cr-Branched-From: 9571654d2dc33e0b9ed845f45b17786ec428da84-refs/heads/master@{#60669}