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

[Ahmed Bougacha]

- Bitcast to FP or integer scalars depending on the most common type in the inputs.


http://reviews.llvm.org/D8948

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

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