[PATCH] [ELF] Create reference to symbol map.

[Shankar Kalpathi Easwaran]

Hi ruiu, atanasyan,

In LLD's model, symbol is a property of the node (atom) and not a property of edge (reference). Prior to this patch, we stored the symbol in the reference. From post-commit comments, it seemed better to create a map from the reference to the symbol instead and use this mapping wherever desired. 

This patch does that.

http://reviews.llvm.org/D7840

Files:
  lib/ReaderWriter/ELF/Atoms.h
  lib/ReaderWriter/ELF/ELFFile.h
  lib/ReaderWriter/ELF/Mips/MipsELFFile.h

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