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from 8ea31b8db0c [InstSimplify] add vector select tests with undef elts in c [...] new 20ea0e4c87d [DAG, X86] Revert r324797, r324491, and r324359.

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Summary of changes: include/llvm/CodeGen/SelectionDAGNodes.h | 39 +- lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 294 +++++++++---- lib/Target/X86/X86ISelDAGToDAG.cpp | 64 ++- test/CodeGen/X86/avg.ll | 114 ++--- test/CodeGen/X86/avx-vbroadcastf128.ll | 6 +- test/CodeGen/X86/avx2-vbroadcast.ll | 191 ++++++--- test/CodeGen/X86/avx2-vbroadcasti128.ll | 6 +- test/CodeGen/X86/avx512-vbroadcasti128.ll | 9 +- test/CodeGen/X86/foldmem_cycle.ll | 34 -- test/CodeGen/X86/i256-add.ll | 145 ++++--- test/CodeGen/X86/load-op-store-fusion.ll | 32 -- test/CodeGen/X86/masked_memop.ll | 3 +- test/CodeGen/X86/merge-consecutive-stores.ll | 9 +- test/CodeGen/X86/nontemporal.ll | 82 ++-- test/CodeGen/X86/store_op_load_fold2.ll | 12 +- test/CodeGen/X86/subvector-broadcast.ll | 48 ++- test/CodeGen/X86/var-permute-256.ll | 540 ++++++++++++++++-------- test/CodeGen/X86/vector-shuffle-variable-256.ll | 3 +- 18 files changed, 986 insertions(+), 645 deletions(-) delete mode 100644 test/CodeGen/X86/foldmem_cycle.ll delete mode 100644 test/CodeGen/X86/load-op-store-fusion.ll