Performance and stability improvements on all platforms.

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

Change-Id: Idb2b19cfef878defeb10342de03d1f206e4b5522
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1586818
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.6.53@{#1}
Cr-Branched-From: 19e9067826e2f40f30aef10f979c5f2199c601e9-refs/heads/master@{#61056}