[PATCH] [ARM] Select VMAXNM and VMINNM regardless of operand order

[Oliver Stannard]

Currently, the ARM backend will select the VMAXNM and VMINNM for these C
expressions:
  (a < b) ? a : b
  (a > b) ? a : b
but not these expressions:
  (a > b) ? b : a
  (a < b) ? b : a

This patch allows all of these expressions to be matched.

http://reviews.llvm.org/D5971

Files:
  lib/Target/ARM/ARMISelLowering.cpp
  test/CodeGen/ARM/vminmaxnm.ll
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