This reverts commit 20e346bd.

Reason for revert: tanks bluebird-doxbee

Original change's description:
> [parser] Remove pretenuring of closures assigned to properties
> 
> This pretenuring was added in https://codereview.chromium.org/5220007,
> back when it was necessary in order to allow use of the closure
> as a "constant function" property. This should no longer be the case,
> and the pretenuring causes some unfortunate downstream effects.
> 
> This patch removes the parser's setting of this bit. If it doesn't
> cause regressions on the perf bots, followup CLs will remove the
> rest of the support for this feature.
> 
> Bug: v8:7442
> Change-Id: I27c43dd4293ce5de921be6c78571e712778d138a
> Reviewed-on: https://chromium-review.googlesource.com/914610
> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
> Commit-Queue: Adam Klein <adamk@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#51254}

Change-Id: I3e133046a4df64792a6652227d419239c628dbfb
Tbr: gsathya@chromium.org
Bug: v8:7442
Reviewed-on: https://chromium-review.googlesource.com/917701Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51280}