Hello,

This patch updates julia to version 1.5.2 and makes corresponding
changes to llvm-julia so that it now uses llvm-9.

I used the list of llvm patches for version 9 found at
https://github.com/JuliaLang/julia/blob/v1.5.2/deps/llvm.mk#L399-L414

I added fixes for broken tests and removed fixes that were no longer
necessary. It appears to build correctly, but please let me know if any
additional changes are needed.

Thanks,
Tim