Rollup merge of #98713 - nikomatsakis:issue-98693, r=jackh726

Rollup merge of #98713 - nikomatsakis:issue-98693, r=jackh726

promote placeholder bounds to 'static obligations

In NLL, when we are promoting a bound out from a closure, if we have a requirement that `T: 'a` where `'a` is in a higher universe, we were previously ignoring that, which is totally wrong. We should be promoting those constraints to `'static`, since universes are not expressible across closure boundaries.

Fixes #98693

~~(Marking as WIP because I'm still running tests, haven't add the new test, etc)~~

r? ``@jackh726``