LDC 1.9.0 beta

[kinke]

On Tuesday, 24 April 2018 at 15:53:23 UTC, Joakim wrote:
> Yeah, this beta doesn't even have a MIPS backend.

[The prebuilt binaries don't.] I thought about it for a second, 
but releasing a new LDC-LLVM version (and me having to build the 
4 Windows variants again) seemed too troublesome for the gain. We 
can add the backend for v6.0.1 (and maybe revise that targets 
list in general).
FWIW, I included the AArch64 target for the prebuilt armhf 
LLVM/LDC this time.