Performance and stability improvements on all platforms.

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

Change-Id: I45dd485b1b9e4f58a82933dbd7df7f7739a24797
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1548937
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.160@{#1}
Cr-Branched-From: 9ac3ec565d7f4be3fa1a8e84cd8694e6c69fd291-refs/heads/master@{#60564}