[PATCH] Allow setcc (sext setcc) [0|1] [eq|ne] -> setcc

[Matt Arsenault]

The cases where the inner setcc was directly compared
was handled, but not if the setcc type needs to be promoted
when comparing.
    
Remove redundant R600 handling of a subset of cases the existing 
function handles.

http://reviews.llvm.org/D4600

Files:
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  lib/Target/R600/SIISelLowering.cpp
  test/CodeGen/R600/setcc-opt.ll
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