which LLVM source should I use in order to use SPIRV through DCompute ?

[bioinfornatics]

Dear,

Dcompute: https://github.com/libmir/dcompute need a SPIRV capable 
LLVM.
For this Dcompute project show 
https://github.com/thewilsonator/llvm as a SPIRV capable LLVM.

But it is not an official llvm source, moreover the source is 
outdated. Indeed it provide LLVM 5.0.0 while the current stable 
is the 6.0.0

Furthermore kronos group provide too an old SPIRV capable LLVM 
https://github.com/KhronosGroup/SPIRV-LLVM (3.6.1)

So can I use official LLVM source in order to use dcompute ?
If no, why the SPIRV feature part added to LLVM was not send to 
the upstream ?

Thanks

Best regard