Performance and stability improvements on all platforms.

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

Change-Id: Ieabfe121c0648cb49582602e9db539dae85c4d0b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1529940
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.83@{#1}
Cr-Branched-From: 93777911ff2c8c3a0f5e637c095f71203a82ad5c-refs/heads/master@{#60359}