Performance and stability improvements on all platforms.

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

Change-Id: I5bc0c83f65a7e79b95ef745ba38755962385a672
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1560662
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.235@{#1}
Cr-Branched-From: 251d1623f34fba74fb84262914946840c5cd629c-refs/heads/master@{#60736}