[PATCH] CodeGenPrep: sink extends of illegal types into use block.

[Tim Northover]

  Yep, I think I see the logic here and it does seem more robust. I think it's fine to commit too.

  Cheers.

  Tim.

http://llvm-reviews.chandlerc.com/D3021

BRANCH
  mul128_2

ARCANIST PROJECT
  llvm