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

[Oliver Stannard]

Hi jroelofs, arsenm,

Some optimisations in DAGCombiner cause miscompilations for targets that use TargetLowering::UndefinedBooleanContent, because they assume that the results of a SELECT_CC node are boolean values, and can be safely ANDed, ORed and XORed. These optimisations are only valid for targets that use ZeroOrOneBooleanContent or ZeroOrNegativeOneBooleanContent.

This is a follow-up to D6210/r221693.

http://reviews.llvm.org/D6249

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