Performance and stability improvements on all platforms.

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

Change-Id: Ibb835b1b41b86dd73f1aa30cde4ae2a4f9b7854a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1869855
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/8.0.1@{#1}
Cr-Branched-From: 61eefd1395b0ee5bb66e4b73f767ec4a24bc832e-refs/heads/master@{#64395}