Performance and stability improvements on all platforms.

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

Change-Id: I269bfa92bc211bfc7659696ff027f0f0ba31cfd6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1565698
Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/7.5.262@{#1}
Cr-Branched-From: 653a5ad5c18018f1dfb326347e17d57575fbbaa2-refs/heads/master@{#60799}