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: Id471a0127c656d05b4cfe358371bfc2b4ec29b05
Reviewed-on: https://chromium-review.googlesource.com/1160345
Reviewed-by: V8 Autoroller <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.0.134@{#1}
Cr-Branched-From: 656fe43e724b1222058e13d91f92dee4b06c44d0-refs/heads/master@{#54864}