[turbofan] Remove redundant code.

[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}

[Mircea Trofin, 2015-11-03 01:40:14]

Description was changed from

==========
[turbofan] Remove redundant code.



BUG=
==========

to

==========
[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=
==========

[Mircea Trofin, 2015-11-03 01:40:34]

mtrofin@chromium.org changed reviewers:
+ bmeurer@chromium.org, jarin@chromium.org

[Benedikt Meurer, 2015-11-03 05:32:21]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2015-11-03 05:32:22]

lgtm

[commit-bot: I haz the power, 2015-11-03 05:32:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1428943004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1428943004/1

[commit-bot: I haz the power, 2015-11-03 05:33:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-03 05:34:20]

Patchset 1 (id:??) landed as
https://crrev.com/c03d7a7f03657a452f71277d84e435ed73566327
Cr-Commit-Position: refs/heads/master@{#31729}

[Benedikt Meurer, 2015-11-03 07:41:54]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1416293004/ by bmeurer@chromium.org.

The reason for reverting is: This CL reintroduces all kinds of funny moves for
Merges of deferred code, which makes jump threading ineffective..