Performance and stability improvements on all platforms.

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

Change-Id: Ibdcefbd21f8c5d8701cbeb6f40a25e3183bf658b
Reviewed-on: https://chromium-review.googlesource.com/c/1369084
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.3.72@{#1}
Cr-Branched-From: c198a9b497b0cbf4082c2b213bcd9b2fa972abc1-refs/heads/master@{#58110}