Performance and stability improvements on all platforms.

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

Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: Id33a28475e289c76f370f38eef9dbb1b27c5669d
Reviewed-on: https://chromium-review.googlesource.com/1199909
Reviewed-by: V8 Autoroller <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.1.3@{#1}
Cr-Branched-From: 81fb59c638852b7519e3e1b053991a39b1e0cad7-refs/heads/master@{#55565}