[PATCH] D13035: LiveIntervalAnalysis: Avoid multiple connected liveness components

[Matthias Braun via llvm-commits]

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We may have subregister defs which are unused but not discovered and
cleaned up prior to liveness analysis. This creates multiple connected
components in the resultsing live range which are forbidden in the
MachineVerifier because they would unnecesarily constrain the register
allocation. Rewrite those dead definitions to define a newly created
virtual register.

Repository:
  rL LLVM

http://reviews.llvm.org/D13035

Files:
  include/llvm/CodeGen/LiveIntervalAnalysis.h
  lib/CodeGen/LiveIntervalAnalysis.cpp
  test/CodeGen/AMDGPU/partially-dead-super-register-immediate.ll

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