[PATCH] [yaml2obj] ELF Relocations Support

[Simon Atanasyan]

Hi Bigcheese, silvas,

The patch implements support for both relocation record formats: `Elf_Rel` and `Elf_Rela`. It is possible to define relocation against symbol only.
Relocations against sections will be implemented later. Now `yaml2obj` recognizes `X86_64`, `MIPS` and `Hexagon` relocation types.

Example of relocation section specification:
```
Sections:
- Name: .text
  Type: SHT_PROGBITS
  Content: "0000000000000000"
  AddressAlign: 16
  Flags: [SHF_ALLOC]

- !Relocations
  Name: .rel.text
  Type: SHT_REL
  Info: .text
  AddressAlign: 4
  Relocations:
    - Offset: 0x1
      Symbol: glob1
      Type: R_MIPS_32
    - Offset: 0x2
      Symbol: glob2
      Type: R_MIPS_CALL16
```

http://reviews.llvm.org/D3302

Files:
  include/llvm/Object/ELFYAML.h
  lib/Object/ELFYAML.cpp
  test/Object/yaml2obj-elf-rel.yaml
  tools/yaml2obj/yaml2elf.cpp
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