Performance and stability improvements on all platforms.

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

Change-Id: I924b54d05891a84dc778b39623e9628d47c2653e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1584222
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.6.36@{#1}
Cr-Branched-From: 11b7308f236ff689d218909abf46fe46ccf7bf3d-refs/heads/master@{#61014}