[PATCH] [lld][Driver] Parallelize reading initial object files.

[Michael Spencer]

  > In future may be, atoms from each section can be parallelized too, which will make the reader very powerful. The references vector may need to change.
  >
  > What do you think ?

  A reader can do this, sure. We just need to ensure the section is large enough to overcome the cost of creating a task.

http://llvm-reviews.chandlerc.com/D664