[PATCH] [CodeGen] Combine concat_vectors of scalars into build_vector.

[Ahmed Bougacha]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8948

Files:
  llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/trunk/test/CodeGen/AArch64/concat_vector-scalar-combine.ll

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