[turbofan] Remove locally constructed simplified builders.

[turbofan] Remove locally constructed simplified builders.

This removes all locally constructed SimplifiedOperatorBuilder instances
and uses the one passed along the JSGraph. It ensures that the correct
zone is used to allocate operators, no matter where the reducer is used.

R=bmeurer@chromium.org

Committed: https://crrev.com/dbae315a102506b743269c1d9939c617a067ae20
Cr-Commit-Position: refs/heads/master@{#31355}

[Benedikt Meurer, 2015-10-17 04:42:27]

lgtm

[Michael Starzinger, 2015-10-19 07:43:35]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-10-19 07:43:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1410003002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1410003002/1

[commit-bot: I haz the power, 2015-10-19 08:05:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-19 08:05:33]

Patchset 1 (id:??) landed as
https://crrev.com/dbae315a102506b743269c1d9939c617a067ae20
Cr-Commit-Position: refs/heads/master@{#31355}