Performance and stability improvements on all platforms.

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

Change-Id: I498358a9048b4b8faadbddb7537b54eb3b117d28
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1571128
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.284@{#1}
Cr-Branched-From: 1d59bfe5b7bf9ac3902ee5dba131385d2712c5e9-refs/heads/master@{#60889}