Performance and stability improvements on all platforms.

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

Change-Id: Ia7d471d2940fae2258901a4c87b71740ed640d91
Reviewed-on: https://chromium-review.googlesource.com/c/1369093
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.3.75@{#1}
Cr-Branched-From: e98c72a1a64552791d4727d227130bca29018ae9-refs/heads/master@{#58113}