Revert of [turbofan] Introduce LoadFunctionPrototype simplified operator. (patchset #1 id:1 of https://codereview.chromium.org/2517913002/ )

Reason for revert:
Blocks roll https://codereview.chromium.org/2517963002/

Original issue's description:
> [turbofan] Introduce LoadFunctionPrototype simplified operator.
>
> Add a LoadFunctionPrototype simplified operator, similar to what
> Crankshaft has, that loads the prototype property of a constructor
> function.
>
> R=jarin@chromium.org
> BUG=v8:5267
>
> Committed: https://crrev.com/1737b2c74b50168e96ef1263def0eb43505fa80c
> Cr-Commit-Position: refs/heads/master@{#41127}

TBR=jarin@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5267

Review-Url: https://codereview.chromium.org/2514363002
Cr-Commit-Position: refs/heads/master@{#41141}