Performance and stability improvements on all platforms.

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

Change-Id: I8bd47ded8ca9853bbb1f9c8236206c295058cafc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1582679
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.6.23@{#1}
Cr-Branched-From: 2209d169c0e5196ba5e53b5cb211cc3d5d05505b-refs/heads/master@{#60986}