Auto merge of #60174 - matthewjasper:add-match-arm-scopes, r=pnkfelix

Auto merge of #60174 - matthewjasper:add-match-arm-scopes, r=pnkfelix

Add match arm scopes and other scope fixes

* Add drop and lint scopes for match arms.
* Lint attributes are now respected on match arms.
* Make sure we emit a StorageDead if we diverge when initializing a temporary.
* Adjust MIR pretty printing of scopes for locals.
* Don't generate duplicate lint scopes for `let statements`.
* Add some previously missing fake borrows for matches.

closes #46525

cc @rust-lang/compiler