Handle Prov better

[ouz-a]

As of right now we cover Prov here by just making it Opaque and that is not very useful, instead we could handle them similar to how we handle DefId and would allow us to call global_alloc helping us to find out a lot of useful stuff.

[ericmarkmartin]

@rustbot claim

[oli-obk]

call global_alloc helping us to find out a lot of useful stuff.

We still need this in order to get a SMIR version of GlobalAlloc

[celinval]

I believe rust-lang/rust#118012 covered the missing bit.