[PATCH] AArch64: Enable subregister liveness tracking.

[Matthias Braun]

Abandoning this: There are no measurable performance benefits, so this is not worth the compiletime. We don't need this for testing the subreg infrastructure as AMDGPU (and an out-of-tree target) already have it enabled.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8474

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