Performance and stability improvements on all platforms.

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

Change-Id: I8e23cdd9155af889d2d6adf327b40f6b72e3eb33
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1513168
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.6@{#1}
Cr-Branched-From: acfed8a0b61b86a1437e1e4db7674012083ef589-refs/heads/master@{#60137}