This reverts commit 98bbe37e.

Reason for revert: breaks gc_stress bot
https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20gc%20stress/22113

Original change's description:
> Remove always-true --harmony-object-from-entries runtime flag
>
> It shipped in Chrome 73.
>
> Bug: v8:8021
> Change-Id: I82875829ff081ce055a0184170b15c65efca1c38
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1581647
> Commit-Queue: Mathias Bynens <mathias@chromium.org>
> Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
> Auto-Submit: Mathias Bynens <mathias@chromium.org>
> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60992}

TBR=gsathya@chromium.org,mathias@chromium.org

Change-Id: I812d62a7e8b70a8646e606da5f0f8812fac330c7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8021
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1582882
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60994}