Performance and stability improvements on all platforms.

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

Change-Id: Ifb0397b5011ccd161c861d10035b6c484a77ac7e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1599088
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.6.111@{#1}
Cr-Branched-From: 70678d53a112fd41c442d87caf186e776a420a92-refs/heads/master@{#61264}