Performance and stability improvements on all platforms.

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

Change-Id: I1cdfd94317d00f27fb76f2d1e1006261665970c9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1553019
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.186@{#1}
Cr-Branched-From: 3e71841f18fe97082951d8dce6086213da0cccc5-refs/heads/master@{#60626}