[PATCH] Add a LOAD_SEQUENCE_POINT ISDOpcode

[Richard Sandiford]

  Tweaked the comment to say what does the reordering.

http://llvm-reviews.chandlerc.com/D2171

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2171?vs=5511&id=5538#toc

Files:
  include/llvm/CodeGen/ISDOpcodes.h
  include/llvm/Target/TargetLowering.h
  include/llvm/Target/TargetSelectionDAG.td
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
  lib/CodeGen/TargetLoweringBase.cpp
  lib/Target/SystemZ/SystemZAsmPrinter.cpp
  lib/Target/SystemZ/SystemZISelLowering.cpp
  lib/Target/SystemZ/SystemZISelLowering.h
  lib/Target/SystemZ/SystemZInstrInfo.td
  lib/Target/SystemZ/SystemZProcessors.td
  lib/Target/SystemZ/SystemZSubtarget.cpp
  lib/Target/SystemZ/SystemZSubtarget.h
  test/CodeGen/SystemZ/Large/branch-range-01.py
  test/CodeGen/SystemZ/Large/branch-range-02.py
  test/CodeGen/SystemZ/Large/branch-range-03.py
  test/CodeGen/SystemZ/Large/branch-range-04.py
  test/CodeGen/SystemZ/Large/branch-range-05.py
  test/CodeGen/SystemZ/Large/branch-range-06.py
  test/CodeGen/SystemZ/Large/branch-range-09.py
  test/CodeGen/SystemZ/Large/branch-range-10.py
  test/CodeGen/SystemZ/Large/branch-range-11.py
  test/CodeGen/SystemZ/Large/branch-range-12.py
  test/CodeGen/SystemZ/frame-13.ll
  test/CodeGen/SystemZ/frame-14.ll
  test/CodeGen/SystemZ/serialize-01.ll
  test/CodeGen/SystemZ/spill-01.ll
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