missing shared libraries in libclang-5.0-dev?
I don't think anybody *ever* requested such dynamic libs, I don't know if nobody ever cared,
or they aren't really useful (and I think they are really big IIRC, mips was even unable to link them together in some
of the builds I did, because the sum of them was > 512MB).
In case you really want them, better open a debian issue, against the latest stable llvm package (llvm-toolchain-6.0 right now)
and move the discussion there.