[PATCH] Fix illegal DAG produced by SelectionDAG::getConstant() for v2i64 type

[Daniel Sanders]

  Refreshed patch before commit and fixed build errors caused by rebasing beyond
  r194467-r1944472

Hi bkramer,

http://llvm-reviews.chandlerc.com/D1973

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1973?vs=5380&id=5569#toc

BRANCH
  msa/bugfix-getconstant2

ARCANIST PROJECT
  llvm

Files:
  include/llvm/CodeGen/SelectionDAG.h
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
  lib/Target/Mips/MipsSEISelLowering.cpp
  test/CodeGen/Mips/msa/3r-b.ll
  test/CodeGen/Mips/msa/bit.ll
  test/CodeGen/Mips/msa/elm_shift_slide.ll
  test/CodeGen/Mips/msa/i5-a.ll
  test/CodeGen/Mips/msa/i5-b.ll
  test/CodeGen/Mips/msa/i5-c.ll
  test/CodeGen/Mips/msa/i5-m.ll
  test/CodeGen/Mips/msa/i5-s.ll
  test/CodeGen/Mips/msa/llvm-stress-s1704963983.ll
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