[PATCH] Fix optimisations of SELECT_CC which assumed result is boolean

[Oliver Stannard]

Use isConstTrueVal instead of hard-coding either 1 or AllOnes.

http://reviews.llvm.org/D6249

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/ARM/select_xform.ll
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