Performance and stability improvements on all platforms.

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

Change-Id: Iae9fdfbd194296122e9ef7bb175b70474c15fc69
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1598255
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.6.106@{#1}
Cr-Branched-From: e5feab6d26aee0e6a39cc6f02287955949c2f88f-refs/heads/master@{#61255}