Performance and stability improvements on all platforms.

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

Change-Id: I64b9d94b00fd0f9cfeb3a3f505706d1dc0549889
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1620831
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.6.226@{#1}
Cr-Branched-From: 42fee61a97c7168a13d4e4c6d3454e21b1488fd3-refs/heads/master@{#61671}