[PATCH] [lld][ARM] Handle mapping symbols

[Denis Protivensky]

Hi ruiu, shankarke,

Mapping symbols should have their own code models, and in some places must be treated in a specific way.
Make $t denote Thumb code, and $a and $d denote ARM code.
Set size, binding and type of mapping symbols to what the specification says.

http://reviews.llvm.org/D8601

Files:
  include/lld/Core/DefinedAtom.h
  lib/ReaderWriter/ELF/ARM/ARMELFFile.h
  lib/ReaderWriter/ELF/ARM/ARMLinkingContext.cpp
  lib/ReaderWriter/ELF/ARM/ARMLinkingContext.h
  lib/ReaderWriter/ELF/ARM/ARMRelocationHandler.cpp
  lib/ReaderWriter/ELF/ARM/ARMRelocationPass.cpp
  lib/ReaderWriter/ELF/ARM/ARMSymbolTable.h
  lib/ReaderWriter/ELF/Atoms.h
  lib/ReaderWriter/YAML/ReaderWriterYAML.cpp
  test/elf/ARM/mapping-code-model.test
  test/elf/ARM/mapping-symbols.test

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