[PATCH] ARM: allow machine-CSE on litpool materialisations of a global

[Tim Northover]

  Added a specific test for this functionality. Just the one configuration in machine-licm.ll was a little sketchy.

http://llvm-reviews.chandlerc.com/D2272

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2272?vs=5773&id=5776#toc

Files:
  lib/Target/ARM/ARMBaseInstrInfo.cpp
  lib/Target/ARM/ARMExpandPseudoInsts.cpp
  lib/Target/ARM/ARMISelDAGToDAG.cpp
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMInstrInfo.td
  lib/Target/ARM/ARMInstrThumb.td
  test/CodeGen/ARM/cse-ldrlit.ll
  test/CodeGen/ARM/indirectbr.ll
  test/CodeGen/ARM/machine-licm.ll
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