Auto merge of #112026 - saethlin:misaligned-addrof, r=pnkfelix

Don't check for misaligned raw pointer derefs inside Rvalue::AddressOf

From rust-lang/rust#112026 (comment):

rustc 1.70 (stable next week) added a Mir pass to add pointer alignment checks in debug mode. Adding these checks caused some crates to break, but that was expected, since they contain broken code (rust-lang/rust#111487) for tracking that.

However, the checks added are slightly more aggressive than they should have been. Specifically, they also check the place in an `addr_of!` expression. Whether lack of alignment there is or isn't UB is unclear. This PR modifies the pass to not affect those cases.

I spot checked the crater regressions and the ones I saw were not the case that this PR is modifying. It still seems good to not land anything overaggressive though

Author: bors