Building against LLVM 6.0

[Per Nordlöw]

On Sunday, 15 April 2018 at 22:23:19 UTC, kinke wrote:
> [1] https://github.com/ldc-developers/llvm
> [2] https://github.com/ldc-developers/ldc/releases/tag/CI
> [3] 
> https://github.com/ldc-developers/llvm/blob/ldc-release_60/.circleci/config.yml
> [4] 
> https://github.com/ldc-developers/ldc/blob/master/.circleci/config.yml

Wonderful! Thanks.

I'm curious to see whether there are any improvements to LLVM-6.0 
codegen; I have an annoying  performance problem I'm 
investigating.