[llvm-commits] ELFReader.cpp update - Add support for References.

[Sid Manning]

This patch adds support for collection of References in object files.

The ELFReference class is a derived class of Reference and adds
a new member, TargetNameOffset.  TargetNameOffset is used to
reference the index ELF_R_SYM would point to.  These offsets are
recorded in a vector SymbolNames", added to the ELFFile class.
A findAtom(StringRef) method was added to the ELFFile class that uses
the above to locate matching atoms to fill in the Reference's target Atom.

The ELFDefinedAtom class has been extended to take a ReferenceStartIndex
and a ReferenceEndIndex.  Each Atom that contains references outside
its own scope will have a, "Reference" stored in the Reference class.

The FileELF method now records the contains of the .rela/rel sections
and stores those into a map, (sectionName, reloclist[])
   std::map<llvm::StringRef, std::vector<Elf_Rel *>> RelocationReferences;


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