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from 14a520d8321 [llvm-exegesis][NFC] Remove unnecessary member variables. new ce1c8d90ff4 Improve handling of COPY instructions with identical value numbers new c39bf69d806 SafepointIRVerifier should ignore dead blocks and dead edges

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Summary of changes: lib/CodeGen/RegisterCoalescer.cpp | 154 +++++++++--- lib/IR/SafepointIRVerifier.cpp | 217 ++++++++++++++--- .../AMDGPU/coalescer-extend-pruned-subrange.mir | 116 +++++++++ .../AMDGPU/coalescer-identical-values-undef.mir | 29 +++ ...coalescer-subranges-another-copymi-not-live.mir | 133 ++++++++++ .../coalescer-subranges-another-prune-error.mir | 268 +++++++++++++++++++++ .../AMDGPU/coalescer-subregjoin-fullcopy.mir | 177 ++++++++++++++ .../coalescer-with-subregs-bad-identical.mir | 184 ++++++++++++++ .../AMDGPU/coalescing-with-subregs-in-loop-bug.mir | 98 ++++++++ 9 files changed, 1320 insertions(+), 56 deletions(-) create mode 100644 test/CodeGen/AMDGPU/coalescer-extend-pruned-subrange.mir create mode 100644 test/CodeGen/AMDGPU/coalescer-identical-values-undef.mir create mode 100644 test/CodeGen/AMDGPU/coalescer-subranges-another-copymi-not-live.mir create mode 100644 test/CodeGen/AMDGPU/coalescer-subranges-another-prune-error.mir create mode 100644 test/CodeGen/AMDGPU/coalescer-subregjoin-fullcopy.mir create mode 100644 test/CodeGen/AMDGPU/coalescer-with-subregs-bad-identical.mir create mode 100644 test/CodeGen/AMDGPU/coalescing-with-subregs-in-loop-bug.mir