[PATCH] CMake: Stop using LLVM's custom parse_arguments. NFC

[Filipe Cabecinhas]

Hi pcc, beanz, chapuni,

Use CMake's cmake_parse_arguments() instead.
It's called in a slightly different way, but supports all our use cases.
It's in CMake 2.8.8, which is our minimum supported version.

CMake 3.0 doc (roughly the same. No direct link to 2.8.8 doc):
http://www.cmake.org/cmake/help/v3.0/module/CMakeParseArguments.html?highlight=cmake_parse_arguments

Finally, delete LLVM's parse_arguments() definition.

This is dependent on http://reviews.llvm.org/D10529

http://reviews.llvm.org/D10531

Files:
  cmake/modules/AddLLVM.cmake
  cmake/modules/LLVMParseArguments.cmake

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