[turbofan] Remove the useless SimplifiedOperatorReducer.

[turbofan] Remove the useless SimplifiedOperatorReducer.

The SimplifiedOperatorReducer is (mostly) unused, except for the very
rough store elimination, and just eats compilation time.

R=jarin@chromium.org

Committed: https://crrev.com/19482d29e525ab939224ca9c24dba6e22be92da3
Cr-Commit-Position: refs/heads/master@{#28673}

[Jarin, 2015-05-28 08:23:05]

On 2015/05/28 08:06:31, Benedikt Meurer wrote:

Assuming the constant propagation through changes is not necessary, lgtm.

[Benedikt Meurer, 2015-05-28 08:36:29]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-05-28 08:36:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1162563002/1

[commit-bot: I haz the power, 2015-05-28 08:38:08]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-28 08:38:23]

Patchset 1 (id:??) landed as
https://crrev.com/19482d29e525ab939224ca9c24dba6e22be92da3
Cr-Commit-Position: refs/heads/master@{#28673}