Performance and stability improvements on all platforms.

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

Change-Id: Idf61ea201b951476252f13cb984900ec75a465fb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1598381
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.6.113@{#1}
Cr-Branched-From: 758700a70895ed996befefae35e587cdb89e7c47-refs/heads/master@{#61271}