[PATCH] D153877: RegisterCoaleser: Fix empty subrange verifier error

[Matt Arsenault via Phabricator via llvm-commits]

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In this example an implicit def had live-out undef subrange
defs. After coalescing with the def from a previous block, the
undef-defed lanes are no longer live out of the block in the new
interval. An empty subrange was tenatively created for these lanes,
but it must be deleted.


https://reviews.llvm.org/D153877

Files:
  llvm/lib/CodeGen/RegisterCoalescer.cpp
  llvm/test/CodeGen/AMDGPU/blender-coalescer-verifier-error-empty-subrange.mir

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