[PATCH] [core] add support to resolve section groups.

[Shankar Kalpathi Easwaran]

Hi kledzik, Bigcheese, rui314, atanasyan,

This functionality adds support to resolve section groups by using group-child and group-parent references. 

http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20140224/206460.html

http://llvm-reviews.chandlerc.com/D3182

Files:
  include/lld/Core/DefinedAtom.h
  include/lld/Core/Reference.h
  include/lld/Core/SymbolTable.h
  lib/Core/DefinedAtom.cpp
  lib/Core/Resolver.cpp
  lib/Core/SymbolTable.cpp
  lib/ReaderWriter/Native/WriterNative.cpp
  lib/ReaderWriter/Reader.cpp
  lib/ReaderWriter/YAML/ReaderWriterYAML.cpp
  test/core/sectiongroup-rearrange-resolve.objtxt
  test/core/sectiongroup-remaining-undef.objtxt
  test/core/sectiongroup-resolve.objtxt
  test/core/sectiongroup-simple.objtxt
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