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from 9f9755d867f [NVPTX] Handle __nvvm_reflect("__CUDA_ARCH"). new 7166ee595d5 DAG: Enhance isKnownNeverNaN

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Summary of changes: include/llvm/CodeGen/SelectionDAG.h | 11 +- include/llvm/CodeGen/TargetLowering.h | 7 + lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 97 +++- lib/CodeGen/SelectionDAG/TargetLowering.cpp | 13 + lib/Target/AMDGPU/AMDGPUISelLowering.cpp | 83 ++++ lib/Target/AMDGPU/AMDGPUISelLowering.h | 5 + lib/Target/AMDGPU/SIISelLowering.cpp | 11 +- test/CodeGen/AMDGPU/clamp.ll | 34 +- test/CodeGen/AMDGPU/fcanonicalize-elimination.ll | 5 +- test/CodeGen/AMDGPU/fmed3.ll | 73 ++- test/CodeGen/AMDGPU/fmul-2-combine-multi-use.ll | 24 +- test/CodeGen/AMDGPU/known-never-snan.ll | 598 +++++++++++++++++++++++ 12 files changed, 883 insertions(+), 78 deletions(-) create mode 100644 test/CodeGen/AMDGPU/known-never-snan.ll