Rollup merge of #114596 - Kobzol:opt-dist-host, r=lqd

Rename method in `opt-dist`

This makes it clearer that the LLVM is the host one (it doesn't necessarily have to be downloaded). On Linux, it comes from the Dockerfile, on Windows it's downloaded.

Suggested here: rust-lang/rust#114344 (comment)

r? `@lqd`

Author: matthiaskrgr