[PATCH] Fix MipsLongBranch pass to work when the code has inline assembly.

[Sasa Stankovic]

  > Would it make sense to drop the %higher/%highest instructions from the code sequence you generate on
  > MIPS64, making the code a little smaller and faster?

  I added TODO comment for this; I'll implement it in a separate patch.

http://llvm-reviews.chandlerc.com/D3089