Performance and stability improvements on all platforms.

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

Change-Id: I0030f04cfc5804c6bffaf59794106d1820c1c7a5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1512996
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.9@{#1}
Cr-Branched-From: f90e5eb9d3a6e30521d9dc95b5aaef421abe19dd-refs/heads/master@{#60140}