Revert of [turbofan] Remove redundant code. (patchset #1 id:1 of https://codereview.chromium.org/1428943004/ )

Reason for revert:
This CL reintroduces all kinds of funny moves for Merges of deferred code, which makes jump threading ineffective.

Original issue's description:
> [turbofan] Remove redundant code.
>
> When I centralized the treatment of memory operands, I forgot to delete
> the old code.
>
> There is a semantic difference between the old and new code. The old
> code was handling either memory operands, or ranges that had a spilled
> predecessor. The new code handles just memory operands. It may
> happen that (using LinearScan) an active range is spilled when trying
> to allocate another range (see SplitAndSpillIntersecting). That may make
> it a candidate for the old version of the code, however, since we would
> have spilled up to a register use, the old code wouldn't have had taken
> effect.
>
> Perf data shows this nuance doesn't make a difference in perf.
>
> BUG=
>
> Committed: https://crrev.com/c03d7a7f03657a452f71277d84e435ed73566327
> Cr-Commit-Position: refs/heads/master@{#31729}

TBR=jarin@chromium.org,mtrofin@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/1416293004

Cr-Commit-Position: refs/heads/master@{#31732}