[PATCH] [lld][core] sectionGroup support.

[Shankar Kalpathi Easwaran]

Hi kledzik, Bigcheese, ruiu, atanasyan,

This adds initial support for handling section groups.

http://llvm-reviews.chandlerc.com/D2710

Files:
  include/lld/Core/DefinedAtom.h
  include/lld/Core/Reference.h
  include/lld/Core/SymbolTable.h
  lib/Core/DefinedAtom.cpp
  lib/Core/SymbolTable.cpp
  lib/ReaderWriter/Reader.cpp
  lib/ReaderWriter/YAML/ReaderWriterYAML.cpp
  test/core/Inputs/group1.yaml
  test/core/Inputs/group2.yaml
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