PPC: [turbofan] Make MachineType a pair of enums.

PPC: [turbofan] Make MachineType a pair of enums.

Port bb2a830debbff19cf5a510c920ff9ac88d41355c
Port 56673804e026b297a5165e6f807f55aaaad6c6ee

Original commit messages:
    MachineType is now a class with two enum fields:
    - MachineRepresentation
    - MachineSemantic

    Both enums are usable on their own, and this change switches some places
    from using MachineType to use just MachineRepresentation. Most notably:
    - register allocator now uses just the representation.
    - Phi and Select nodes only refer to representations.

   Store nodes use only MachineRepresentation, not MachineType.

R=jarin@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/4903f82c6aa8368baa0ca3beaf3f1b7436f031de
Cr-Commit-Position: refs/heads/master@{#32916}

[MTBrandyberry, 2015-12-16 19:28:01]

The CQ bit was checked by mbrandy@us.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2015-12-16 19:28:04]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1523373003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1523373003/1

[michael_dawson, 2015-12-16 19:29:50]

On 2015/12/16 19:28:04, commit-bot: I haz the power wrote:
> Dry run: CQ is trying da patch. Follow status at
>  https://chromium-cq-status.appspot.com/patch-status/1523373003/1
> View timeline at
>  https://chromium-cq-status.appspot.com/patch-timeline/1523373003/1

lgtm

[commit-bot: I haz the power, 2015-12-16 20:00:27]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-12-16 20:00:28]

Dry run: This issue passed the CQ dry run.

[MTBrandyberry, 2015-12-16 20:01:05]

The CQ bit was checked by mbrandy@us.ibm.com

[commit-bot: I haz the power, 2015-12-16 20:01:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1523373003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1523373003/1

[commit-bot: I haz the power, 2015-12-16 20:02:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-16 20:03:42]

Description was changed from

==========
PPC: [turbofan] Make MachineType a pair of enums.

Port bb2a830debbff19cf5a510c920ff9ac88d41355c
Port 56673804e026b297a5165e6f807f55aaaad6c6ee

Original commit messages:
    MachineType is now a class with two enum fields:
    - MachineRepresentation
    - MachineSemantic

    Both enums are usable on their own, and this change switches some places
    from using MachineType to use just MachineRepresentation. Most notably:
    - register allocator now uses just the representation.
    - Phi and Select nodes only refer to representations.

   Store nodes use only MachineRepresentation, not MachineType.

R=jarin@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=
==========

to

==========
PPC: [turbofan] Make MachineType a pair of enums.

Port bb2a830debbff19cf5a510c920ff9ac88d41355c
Port 56673804e026b297a5165e6f807f55aaaad6c6ee

Original commit messages:
    MachineType is now a class with two enum fields:
    - MachineRepresentation
    - MachineSemantic

    Both enums are usable on their own, and this change switches some places
    from using MachineType to use just MachineRepresentation. Most notably:
    - register allocator now uses just the representation.
    - Phi and Select nodes only refer to representations.

   Store nodes use only MachineRepresentation, not MachineType.

R=jarin@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/4903f82c6aa8368baa0ca3beaf3f1b7436f031de
Cr-Commit-Position: refs/heads/master@{#32916}
==========

[commit-bot: I haz the power, 2015-12-16 20:03:43]

Patchset 1 (id:??) landed as
https://crrev.com/4903f82c6aa8368baa0ca3beaf3f1b7436f031de
Cr-Commit-Position: refs/heads/master@{#32916}