Performance and stability improvements on all platforms.

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

Change-Id: I23e2d36716b6af364a3a132677e3394b925b749f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1568595
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.278@{#1}
Cr-Branched-From: 9e9fb65ef23250d18053e8c2b99e764c74aa278b-refs/heads/master@{#60868}