[PATCH] [ELF] Support --defsym option to define an absolute symbol.

[Shankar Kalpathi Easwaran]

  My bad, the symbol gets defined no matter what, but the symbol thats created(should not be an absolute atom, but a defined atom) needs to have content, the content is set to the expression.

  The thread should have more information on the overall design for supporting --defsym with the Gnu flavor.

http://llvm-reviews.chandlerc.com/D3208

BRANCH
  defsym

ARCANIST PROJECT
  lld