[PATCH] [ELF] Fix undefined symbol handling in DSO.

[Shankar Kalpathi Easwaran]

  I am having some problem with my browser, with inline comments.  and I also think this be converted to 2 patches.

  a) to remove the option (use-shlib-undefines)
  b) fix --[no]allow-shlib-undefined.

  I am not sure the reason we added the option use-shlib-undefines, Bigcheese ?

  Rui, can you wait on Bigcheese's review before removing the option use-shlib-undefines ?

http://reviews.llvm.org/D3304

BRANCH
  shlib

ARCANIST PROJECT
  lld