Revert of Reland: Remove register index/code indirection

Revert of Reland: Remove register index/code indirection (patchset #20 id:380001 of https://codereview.chromium.org/1287383003/ )

Reason for revert:
Failures on MIPS

Original issue's description:
> Remove register index/code indirection
>
> Previous to this patch, both the lithium and TurboFan register
> allocators tracked allocated registers by "indices", rather than
> the register codes used elsewhere in the runtime. This patch
> ensures that codes are used everywhere, and in the process cleans
> up a bunch of redundant code and adds more structure to how the
> set of allocatable registers is defined.
>
> Some highlights of changes:
>
> * TurboFan's RegisterConfiguration class moved to V8's top level
>   so that it can be shared with Crankshaft.
> * Various "ToAllocationIndex" and related methods removed.
> * Code that can be easily shared between Register classes on
>   different platforms is now shared.
> * The list of allocatable registers on each platform is declared
>   as a list rather than implicitly via the register index <->
>   code mapping.
>
> Committed: https://crrev.com/80bc6f6e11f79524e3f1ad05579583adfd5f18b2
> Cr-Commit-Position: refs/heads/master@{#30913}
>
> Committed: https://crrev.com/7b7a8205d9a00c678fb7a6e032a55fecbc1509cf
> Cr-Commit-Position: refs/heads/master@{#31075}

TBR=akos.palfi@imgtec.com,bmeurer@chromium.org,jarin@chromium.org,paul.lind@imgtec.com,titzer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/00e07b00571ac13799380d2da0fbef169750f307
Cr-Commit-Position: refs/heads/master@{#31083}

[danno, 2015-10-02 15:35:48]

Created Revert of Reland: Remove register index/code indirection

[commit-bot: I haz the power, 2015-10-02 15:36:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1380863004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1380863004/1

[commit-bot: I haz the power, 2015-10-02 15:36:58]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-02 15:37:16]

Patchset 1 (id:??) landed as
https://crrev.com/00e07b00571ac13799380d2da0fbef169750f307
Cr-Commit-Position: refs/heads/master@{#31083}