Auto merge of #96549 - ouz-a:mir-opt, r=oli-obk

Move Derefer before Retag

_Follow up work to #96116 #95857 #95649_

This moves `Derefer` before `Retag` and creates a new `LocalInfo` called `Temp` to avoid retagging created temp values.

Zulip discussion [link](https://rust-lang.zulipchat.com/#narrow/stream/189540-t-compiler.2Fwg-mir-opt/topic/deref.20as.20first.20and.20only.20projection)

r? `@oli-obk`

compiler/rustc_middle/src/mir/mod.rs

@@ -1087,6 +1087,8 @@ pub enum LocalInfo<'tcx> {
     /// A temporary created during the creation of an aggregate
     /// (e.g. a temporary for `foo` in `MyStruct { my_field: foo }`)
     AggregateTemp,
+    /// A temporary created during the pass `Derefer` to avoid it's retagging
+    DerefTemp,
 }
 
 impl<'tcx> LocalDecl<'tcx> {