[PATCH] Create a hook in the TargetHandler to find out which atoms need to have dynamic symbol table entry

[Simon Atanasyan]

Hi Bigcheese, ruiu, shankarke,

**[ELF]** Find out which atoms need to have dynamic symbol table entry using new virtual `TargetHandler::needsDynSymEntry()` method. Move default conditions from `DynamicLibraryWriter<ELFT>::buildDynamicSymbolTable` and `OutputELFWriter<ELFT>::buildDynamicSymbolTable` methods to the `DefaultTargetHandler::needsDynSymEntry()` routine. Delete redundant `DynamicLibraryWriter<ELFT>::buildDynamicSymbolTable` method.

**[Mips]** If symbol is referenced by an entry in the global part of GOT, it needs to be exported. Override `needsDynSymEntry()` to satisfy this requirement.

In general, MIPS related modifications can be moved out from this patch. I include them to demonstrate the goal of these changes.

http://llvm-reviews.chandlerc.com/D2574

Files:
  lib/ReaderWriter/ELF/DefaultTargetHandler.h
  lib/ReaderWriter/ELF/DynamicLibraryWriter.h
  lib/ReaderWriter/ELF/Mips/MipsSectionChunks.h
  lib/ReaderWriter/ELF/Mips/MipsTargetHandler.cpp
  lib/ReaderWriter/ELF/Mips/MipsTargetHandler.h
  lib/ReaderWriter/ELF/OutputELFWriter.h
  lib/ReaderWriter/ELF/TargetHandler.h
  test/elf/Mips/exe-dynsym.test
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