[PATCH] [lld][ELF] Dynamic library support

[Shankar Kalpathi Easwaran]

Hi Bigcheese,

This patch adds the below functionalities :-

* Adds required hash section
* Adds changes to Hexagon got and .got.plt sections

This also makes shared libraries work with Hexagon for object files containing PLT/GOTOFF/GOTPCREL relocations.



http://llvm-reviews.chandlerc.com/D587

Files:
  test/elf/Hexagon/dynlib-hash.test
  test/elf/Hexagon/dynlib-gotoff.test
  test/elf/Hexagon/dynlib-syms.test
  test/elf/dynamic.test
  lib/ReaderWriter/ELF/Hexagon/HexagonTargetHandler.cpp
  lib/ReaderWriter/ELF/Hexagon/HexagonTargetHandler.h
  lib/ReaderWriter/ELF/Hexagon/HexagonDynamicAtoms.h
  lib/ReaderWriter/ELF/SectionChunks.h
  lib/ReaderWriter/ELF/OutputELFWriter.h
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