[PATCH] [AArch64] Mark SMIN/SMAX/UMIN/UMAX nodes as legal and add patterns for them

[James Molloy]

Hi aadg, t.p.northover,

The new [SU]{MIN,MAX} SDNodes can be lowered directly to instructions for
most NEON datatypes - the big exclusion being v2i64.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9747

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64InstrInfo.td
  test/CodeGen/AArch64/minmax.ll

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