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

[Rui Ueyama]

  That is out of scope of this patch. Let's don't combine everything into
  one. --defsym=<symbol>=<immediate> is different kind of beast than
  --defsym=<symbol>=<symbol>[+more expressions] although they share the same
  option, and this patch is sufficient for the former. We need to address the
  latter, and we can continue discussing, but that topic is separated from
  this thread.

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

BRANCH
  defsym

ARCANIST PROJECT
  lld