This reverts commit 0c5479df.

Reason for revert: Turns out there is a simpler way to do this.

Original change's description:
> [Turbofan] Make JSCallReducer::ReducePromiseConstructor concurrent
> 
> The only piece missing at this point was to serialize the code
> objects for the resolve and reject handlers.
> 
> Bug: v8:7790
> Change-Id: If636f9d74dfc9606cf5f45c4f02dd118fb5d8f00
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1662295
> Commit-Queue: Michael Stanton <mvstanton@chromium.org>
> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#62215}

TBR=mvstanton@chromium.org,jarin@chromium.org

Change-Id: Ie67326c850623eede8a63b50c5705682db784212
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7790
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1664052Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62231}