Performance and stability improvements on all platforms.

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

Change-Id: I05e65a4de2664ac0130cfbfd5f4aff23324e7e66
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1553021
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.188@{#1}
Cr-Branched-From: f72b919b4186cbc3321c66c41b40ee5c54ec59cf-refs/heads/master@{#60628}