[PATCH] [lld][ELF] Implement relocations.

[Michael Spencer]

Hi shankarke,

This series of patches implements the relocations needed for lld to self host.

[ELF] Replace local dynamic tls access with direct access.
[ELF] Implement GOTPCREL for defined atoms.
[ELF][Layout] Provide a proper way to get the TLS segment size.
[ELF][x86-64] Handle PLT32 relocations to IFUNC.

http://llvm-reviews.chandlerc.com/D366

Files:
  lib/ReaderWriter/ELF/DefaultLayout.h
  lib/ReaderWriter/ELF/X86_64/X86_64TargetHandler.cpp
  lib/ReaderWriter/ELF/X86_64/X86_64TargetInfo.cpp
  test/elf/Inputs/gotpcrel.S
  test/elf/Inputs/undef-gotpcrel.S
  test/elf/Inputs/gotpcrel.x86-64
  test/elf/Inputs/ifunc.S
  test/elf/Inputs/ifunc.x86-64
  test/elf/Inputs/tls.S
  test/elf/Inputs/tls.x86-64
  test/elf/Inputs/undef-gotpcrel.x86-64
  test/elf/gotpcrel.test
  test/elf/undef-gotpcrel.test
  test/elf/ifunc.test
  test/elf/tls.test
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