Performance and stability improvements on all platforms.

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

Change-Id: Ia978ed2ab349c05ee0b961e504e1f61ce892a412
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1499800
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.4.278@{#1}
Cr-Branched-From: 37ff95adc0b113be22601fd13307517290e04744-refs/heads/master@{#60015}