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from f6b5512 Drop error when trying to fallback from PDB to DWARF. new 950b465 DetectDeadLanes: Cleanup, assert on some impossible cases. new 26b4602 DetectDeadLanes: Increase precision when detecting undef inputs

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Summary of changes: lib/CodeGen/DetectDeadLanes.cpp | 191 +++++++++++++++------- test/CodeGen/AMDGPU/detect-dead-lanes.mir | 22 ++- test/CodeGen/AMDGPU/subreg-coalescer-undef-use.ll | 6 +- 3 files changed, 153 insertions(+), 66 deletions(-)