Auto merge of #111007 - JakobDegen:nrvo, r=tmiasko

Disable nrvo mir opt

See #111005 and #110902 . The ICE can definitely be hit on stable, the miscompilation I'm not sure about. The pass makes some pretty sketchy assumptions though, and we should not have it on while that's the case.

I'm not going to work on actually fixing this, it's probably not excessively difficult though.

r? rust-lang/mir-opt

compiler/rustc_mir_transform/src/nrvo.rs

@@ -34,7 +34,8 @@ pub struct RenameReturnPlace;
 
 impl<'tcx> MirPass<'tcx> for RenameReturnPlace {
     fn is_enabled(&self, sess: &rustc_session::Session) -> bool {
-        sess.mir_opt_level() > 0
+        // #111005
+        sess.mir_opt_level() > 0 && sess.opts.unstable_opts.unsound_mir_opts
     }
 
     fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut mir::Body<'tcx>) {