Auto merge of #107449 - saethlin:enable-copyprop, r=oli-obk

Enable CopyProp

r? `@tmiasko`

`@rustbot` label +A-mir-opt

compiler/rustc_middle/src/ty/adt.rs

@@ -406,6 +406,7 @@ impl<'tcx> AdtDef<'tcx> {
     }
 
     /// Return the index of `VariantDef` given a variant id.
+    #[inline]
     pub fn variant_index_with_id(self, vid: DefId) -> VariantIdx {
         self.variants()
             .iter_enumerated()