Performance and stability improvements on all platforms.

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

Change-Id: I1a2c1406a84d6a555cff97a15b792595d219d39f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1553006
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.194@{#1}
Cr-Branched-From: 75ae54c55be91f2fa5cd19ac1a690ab3d3f4659b-refs/heads/master@{#60638}