Performance and stability improvements on all platforms.

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

Change-Id: I0d5880218453a5e9238436c1e4e52769e8a9ea7e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1550702
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.173@{#1}
Cr-Branched-From: f2b2dfa956db5a6cf56370b4886fd983011b169c-refs/heads/master@{#60594}