[PATCH] Enable (sext x) == C --> x == (trunc C) combine

[Matt Arsenault]

Extend the existing code which handles this for zext. This makes this more useful for targets with ZeroOrNegativeOne BooleanContent and obsoletes a custom combine SI uses for i1 setcc (sext(i1), 0, setne) since the constant will now be shrunk to i1.

http://reviews.llvm.org/D6466

Files:
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  lib/Target/R600/SIISelLowering.cpp
  test/CodeGen/R600/setcc-opt.ll
  test/CodeGen/R600/trunc-cmp-constant.ll
  test/CodeGen/X86/shrink-compare.ll
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