[PATCH] LLVM incorrectly folds xor into select

[Oliver Stannard]

LLVM replaces the SelectionDAG pattern (xor (set_cc cc x y) 1) with
(set_cc !cc x y), which is only correct when the xor has type i1.
Instead, we should check that the constant operand to the xor is all
ones.

http://reviews.llvm.org/D6210

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