[PATCH] D24217: Remove unnecessary call to getAllocatableRegClass

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added reviewers: qcolombet, escha.
arsenm added a subscriber: llvm-commits.
Herald added a reviewer: tstellarAMD.
Herald added subscribers: nhaehnle, wdng, arsenm.

New version of D14477.

This reapplies r252565 and r252674, effectively reverting r252956.
    
This allows VS_32/VS_64 to be unallocatable like they should be.

https://reviews.llvm.org/D24217

Files:
  lib/CodeGen/SelectionDAG/InstrEmitter.cpp
  lib/Target/AMDGPU/SIRegisterInfo.cpp
  lib/Target/AMDGPU/SIRegisterInfo.h
  lib/Target/AMDGPU/SIRegisterInfo.td

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