[PATCH] Fix installation location of Doxygen generated documentation in CMake

[Dan Liew]

When the Doxygen documentation is installed using CMake the install
location is the same for both LLVM and Clang (assuming clang source is
in tools/clang). This is bad because some files will over write each
other and generally make a mess of things.

Attached is a patch for LLVM and a patch for Clang to fix this so LLVM
and Clang use different installation locations and use an installation
path that is more similar to the installation location used for the
Sphinx documentation (recently added in r206655).

Thanks,
-- 
Dan Liew
PhD Student - Imperial College London
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