[PATCH] ARM: move CMOV selection to TableGen

[Tim Northover]

Back in the mists of time (2008), it seems TableGen couldn't handle the patterns necessary to match ARM's CMOV node that we convert select operations to, so we wrote a lot of fairly hairy C++ to do it for us.
    
TableGen can deal with it now: there were a few minor differences to CodeGen (see tests), but nothing obviously worse that I could see, so we should probably address anything that *does* come up in a localised manner.

The part I'm most uncertain about is the TableGen changes: it has been fairly thoroughly ingrained that Operands with default values don't take part in selection, so I sidestepped that issue and created a parallel Predicate operand that can be selected.


http://llvm-reviews.chandlerc.com/D1458

Files:
  include/llvm/Target/Target.td
  lib/Target/ARM/ARMExpandPseudoInsts.cpp
  lib/Target/ARM/ARMISelDAGToDAG.cpp
  lib/Target/ARM/ARMInstrFormats.td
  lib/Target/ARM/ARMInstrInfo.td
  lib/Target/ARM/ARMInstrThumb.td
  lib/Target/ARM/ARMInstrThumb2.td
  lib/Target/ARM/ARMInstrVFP.td
  test/CodeGen/ARM/select-imm.ll
  test/CodeGen/ARM/select.ll
  test/CodeGen/ARM/setcc-sentinals.ll
  test/CodeGen/Thumb2/thumb2-select.ll
  utils/TableGen/CodeGenInstruction.cpp
  utils/TableGen/InstrInfoEmitter.cpp
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