Auto merge of #47353 - nikomatsakis:nll-issue-47189, r=pnkfelix+nmatsakis

renumber regions in generators

This fixes #47189, but I think we still have to double check various things around how to treat generators in MIR type check + borrow check (e.g., what borrows should be invalidated by a `Suspend`? What consistency properties should type check be enforcing anyway around the "interior" type?)

Also fixes #47587 thanks to @spastorino's commit.

r? @pnkfelix

diff --cc src/librustc_mir/borrow_check/nll/universal_regions.rs
Simple merge

diff --cc src/librustc_mir/util/pretty.rs
Simple merge