[RegisterConfiguration] Streamline access to arch defaults, simplify Registers.

[RegisterConfiguration] Streamline access to arch defaults, simplify Registers.
Replaces ArchDefault method with Crankshaft and Turbofan getters.
Eliminates IsAllocated method on Register, FloatRegister, DoubleRegister.
Eliminates ToString method too.
Changes call sites to access appropriate arch default RegisterConfiguration.

LOG=N
BUG=

Committed: https://crrev.com/257336d26a9b4f8efad872d3166a5ac3742e9adc
Cr-Commit-Position: refs/heads/master@{#37297}

[bbudge, 2016-06-25 22:42:17]

Description was changed from

==========
[RegisterConfiguration] Streamline getter for arch default configurations.
Replaces ArchDefault method with Crankshaft and Turbofan getters.
Eliminates IsAllocated method on Register, FloatRegister, DoubleRegister.

LOG=N
BUG=
==========

to

==========
[RegisterConfiguration] Streamline access to arch defaults, simplify Registers.
Replaces ArchDefault method with Crankshaft and Turbofan getters.
Eliminates IsAllocated method on Register, FloatRegister, DoubleRegister.
Eliminates ToString method too.
Changes call sites to access appropriate arch default RegisterConfiguration.

LOG=N
BUG=
==========

[bbudge, 2016-06-26 22:15:02]

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

[bbudge, 2016-06-26 22:15:03]

This is pretty mechanical. I made it easier to get the arch default
RegisterConfigurations. Perhaps we shouldn't encourage this use of a global
variable, but it seems difficult to get rid of right now.

I also removed the IsAllocatable and ToString methods. IsAllocatable requires
knowledge of the RegConfig and I don't think Registers should be so smart.
ToString is useful but since it also goes through the RegisterConfiguration, is
convoluted and perhaps error prone.

[Jarin, 2016-06-27 07:19:16]

lgtm. Thanks!

[bbudge, 2016-06-27 14:50:22]

The CQ bit was checked by bbudge@chromium.org

[bbudge, 2016-06-27 14:50:23]

The patchset sent to the CQ was uploaded after l-g-t-m from jarin@chromium.org
Link to the patchset: https://codereview.chromium.org/2092413002/#ps140001
(title: "Fix compile.")

[commit-bot: I haz the power, 2016-06-27 14:50:31]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-06-27 15:30:03]

Description was changed from

==========
[RegisterConfiguration] Streamline access to arch defaults, simplify Registers.
Replaces ArchDefault method with Crankshaft and Turbofan getters.
Eliminates IsAllocated method on Register, FloatRegister, DoubleRegister.
Eliminates ToString method too.
Changes call sites to access appropriate arch default RegisterConfiguration.

LOG=N
BUG=
==========

to

==========
[RegisterConfiguration] Streamline access to arch defaults, simplify Registers.
Replaces ArchDefault method with Crankshaft and Turbofan getters.
Eliminates IsAllocated method on Register, FloatRegister, DoubleRegister.
Eliminates ToString method too.
Changes call sites to access appropriate arch default RegisterConfiguration.

LOG=N
BUG=
==========

[commit-bot: I haz the power, 2016-06-27 15:30:04]

Committed patchset #8 (id:140001)

[commit-bot: I haz the power, 2016-06-27 15:31:45]

Description was changed from

==========
[RegisterConfiguration] Streamline access to arch defaults, simplify Registers.
Replaces ArchDefault method with Crankshaft and Turbofan getters.
Eliminates IsAllocated method on Register, FloatRegister, DoubleRegister.
Eliminates ToString method too.
Changes call sites to access appropriate arch default RegisterConfiguration.

LOG=N
BUG=
==========

to

==========
[RegisterConfiguration] Streamline access to arch defaults, simplify Registers.
Replaces ArchDefault method with Crankshaft and Turbofan getters.
Eliminates IsAllocated method on Register, FloatRegister, DoubleRegister.
Eliminates ToString method too.
Changes call sites to access appropriate arch default RegisterConfiguration.

LOG=N
BUG=

Committed: https://crrev.com/257336d26a9b4f8efad872d3166a5ac3742e9adc
Cr-Commit-Position: refs/heads/master@{#37297}
==========

[commit-bot: I haz the power, 2016-06-27 15:31:47]

Patchset 8 (id:??) landed as
https://crrev.com/257336d26a9b4f8efad872d3166a5ac3742e9adc
Cr-Commit-Position: refs/heads/master@{#37297}