Add miri to rustup

[oli-obk]

It was just added to the distribution in rust-lang/rust#57086

This PR enables calling cargo miri after installing the miri component

[kinnison]

Would it make sense to have a component_for_bin() to map cargo-miri to miri ?

[oli-obk]

I was considering that, but I felt like miri is niche enough so it won't impact too many ppl. I can change it though if anyone thinks it's worthwile

[kinnison]

component_for_bin() is pretty much only used to suggest component names to install if something is missing, but if someone tries to run cargo miri ... and then doesn't get the hint, they might be upset.

I don't mind either way, just thought i'd mention it in case you hadn't already considered and discarded the idea :-D

[kinnison]

Change-wise this looks good 👍 but I would be more comfortable if it were rebased so that there aren't fixup commits in the sequence. I can do this if you don't have time, so long as someone can tell me how to update someone else's PR :-)

[oli-obk]

Updated

[kinnison]

LGTM. @nrc I think this is good for merge. I can't see any reason why it'd break anything.

[nrc]

Thanks!

[aleksmelnikov]

Will miri component be availiable in the next rustup release (1.17.0)?