[PATCH] Update ARM and x86 ArchHandler to match 64bits counterparts. NFC

[Jean-Daniel Dupas]

Hi kledzik,

Define an explicit type for arch specific reference kind and use it in switch statement to make the compiler emit warnings if some case is not cover.
It will help to catch such errors when we add new mach-o reference kind.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7612

Files:
  lib/ReaderWriter/MachO/ArchHandler_arm.cpp
  lib/ReaderWriter/MachO/ArchHandler_x86.cpp

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