This adds support for lowering of nodes having the {JSToObject} operator
even if they have exceptional control projections (e.g. are inside of a
try-block).

R=bmeurer@chromium.org
TEST=mjsunit/compiler/optimized-with

Change-Id: I711ff4935db68c43243a971a8b21989487c86317
Reviewed-on: https://chromium-review.googlesource.com/554628Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46318}