Performance and stability improvements on all platforms.

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

Change-Id: Ib1b607070dfae9b494ab0b6823971d3fa4ae1579
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1565177
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.266@{#1}
Cr-Branched-From: 0c08a7565e175f3232d68aeb2e6ac0787bd31142-refs/heads/master@{#60812}