This reverts commit 2b15425b.

Reason for revert: Re-enabling escape analysis after merging the flag change to 6.1.

Original change's description:
> [turbofan] Temporarily turn off escape analysis.
> 
> Bug: chromium:765433
> Change-Id: Iecc9540f6305bc24a0a5210c149b55403b9ce09d
> Reviewed-on: https://chromium-review.googlesource.com/667106
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48032}

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

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:765433
Change-Id: Icac44fd76e2965df1e143700941b628ea7a69166
Reviewed-on: https://chromium-review.googlesource.com/670864Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48064}