Reduces the overhead of mid-tier optimization without much impact on
mid-tier generated code performance.

BUG=v8:9684

Change-Id: I81889049f718ec2b18a805b11aab119754466c95
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2772611
Auto-Submit: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73509}