[PATCH] add support for merging common strings

[Shankar Kalpathi Easwaran]

  incorporated review comments.

Hi Bigcheese, kledzik,

http://llvm-reviews.chandlerc.com/D387

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D387?vs=936&id=957#toc

Files:
  test/elf/Inputs/constants-merge.x86-64
  test/elf/Inputs/foo.o.x86-64
  test/elf/Inputs/bar.o.x86-64
  test/elf/mergeconstants.objtxt
  test/elf/mergeatoms.objtxt
  test/elf/reloc.objtxt
  lib/ReaderWriter/ELF/File.h
  lib/ReaderWriter/ELF/Atoms.h
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