Performance and stability improvements on all platforms.

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

Change-Id: I525431f76ceaf1aa6d0bc9088d7e542ada3286a3
Reviewed-on: https://chromium-review.googlesource.com/c/1368468
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.3.71@{#1}
Cr-Branched-From: 6275e7e2ee4cfc762b47d1cd9801d012a526d50c-refs/heads/master@{#58109}