Performance and stability improvements on all platforms.

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

Change-Id: I7073196e449b9206a00640fd999343e56e584e7f
Reviewed-on: https://chromium-review.googlesource.com/c/1369090
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.3.74@{#1}
Cr-Branched-From: cfb5bb726f29cb6e4b052672c9235258ff5a6e5a-refs/heads/master@{#58112}