[PATCH] Document new LLVM CMake interface and emit warning when using llvm_map_components_to_libraries

[Dan Liew]

Hi,

Here are my patches to document the LLVM CMake interface and also warn
developers when using the old interface.

For the 0002 patch I wanted to use message(DEPRECATION "msg") but it
seems that CMAKE_ERROR_DEPRECATED and CMAKE_WARNING_DEPRECATED are off
by default so most people would see the warning so I used
message(AUTHOR_WARNING ) instead.

Hopefully these will be the last of my patches related to the LLVM
CMake interface. Once these are approved I'll look into getting them
into the LLVM 3.5 release branch.

Thanks,
Dan.
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