[jcelerier]

Such a compiler exists, it's called zapcc (was a fork of clang 3.something). Sadly it has been abandoned and never merged even though it was opensourced.

[appleflaxen]

The github page states:

> When was the source last merged with LLVM trunk?

> This open-source release was last merged with LLVM 325000 on 2018-02-13.