Rollup merge of #109435 - oli-obk:🇨🇭🥚_copy_op, r=RalfJung

Detect uninhabited types early in const eval

r? `@RalfJung`

implements rust-lang/rust#108442 (comment)

this is a breaking change, as some UB during const eval is now detected instead of silently being ignored. Users can see this and other UB that may cause future breakage with `-Zextra-const-ub-checks` or just by running miri on their code, which sets that flag by default.

Author: Dylan-DPC

src/machine.rs

@@ -812,7 +812,7 @@ impl<'mir, 'tcx> Machine<'mir, 'tcx> for MiriMachine<'mir, 'tcx> {
     }
 
     #[inline(always)]
-    fn enforce_validity(ecx: &MiriInterpCx<'mir, 'tcx>) -> bool {
+    fn enforce_validity(ecx: &MiriInterpCx<'mir, 'tcx>, _layout: TyAndLayout<'tcx>) -> bool {
         ecx.machine.validate
     }