Performance and stability improvements on all platforms.

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

Change-Id: I42c4b98cf787e107c317efc4d1a347abb05bb248
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1554727
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.199@{#1}
Cr-Branched-From: 62be40f7cd75448f2877354e8254760882937a92-refs/heads/master@{#60647}