Rollup merge of #100034 - tmiasko:elaborate-box-derefs, r=oli-obk

Elaborate all box dereferences in `ElaborateBoxDerefs`

so that it is the only pass responsible for elaboration, instead of
splitting this responsibility between the `StateTransform` and
`ElaborateBoxDerefs`.

compiler/rustc_middle/src/mir/mod.rs

@@ -1531,6 +1531,7 @@ impl<'tcx> Place<'tcx> {
 }
 
 impl From<Local> for Place<'_> {
+    #[inline]
     fn from(local: Local) -> Self {
         Place { local, projection: List::empty() }
     }