[turbofan] cleanup ParallelMove

[turbofan] cleanup ParallelMove

- make ParallelMove into a ZoneVector, removing an annoying level of indirection
- make MoveOperands hold InstructionOperands instead of pointers, so there's no more operand aliasing for moves
- opens up possibility of storing MachineType in allocated operands

R=bmeurer@chromium.org
BUG=

Committed: https://crrev.com/00aec7907936326e9c8f12299419bde12b7eff60
Cr-Commit-Position: refs/heads/master@{#27842}

[dcarney, 2015-04-15 12:28:54]

dcarney@chromium.org changed reviewers:
+ bmeurer@chromium.org

[dcarney, 2015-04-15 12:29:55]

ptal

[Benedikt Meurer, 2015-04-15 12:32:54]

lgtm

[dcarney, 2015-04-15 12:34:44]

The CQ bit was checked by dcarney@chromium.org

[commit-bot: I haz the power, 2015-04-15 12:34:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1081373002/140001

[commit-bot: I haz the power, 2015-04-15 12:36:40]

Committed patchset #8 (id:140001)

[commit-bot: I haz the power, 2015-04-15 12:36:51]

Patchset 8 (id:??) landed as
https://crrev.com/00aec7907936326e9c8f12299419bde12b7eff60
Cr-Commit-Position: refs/heads/master@{#27842}