Performance and stability improvements on all platforms.

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

Change-Id: I327a5514e27c564c9033cbef5945a314c4a12074
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1669189
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.7.120@{#1}
Cr-Branched-From: 82622c52f56739c154fe980291fe48a0e19a4223-refs/heads/master@{#62301}