refactor: move the convert mod from rustc_smir to stable_mir

Author: makai410

compiler/rustc_smir/src/rustc_internal/mod.rs

@@ -17,9 +17,7 @@ use rustc_span::Span;
 use rustc_span::def_id::{CrateNum, DefId};
 use scoped_tls::scoped_thread_local;
 use stable_mir::Error;
-use stable_mir::abi::Layout;
-use stable_mir::compiler_interface::SmirInterface;
-use stable_mir::ty::IndexedVal;
+use stable_mir::convert::{RustcInternal, Stable};
 
 use crate::rustc_smir::context::SmirCtxt;
 use crate::rustc_smir::{Bridge, IndexedVal, SmirContainer, Tables};
@@ -341,11 +339,3 @@ impl<K: PartialEq + Hash + Eq, V: Copy + Debug + PartialEq + IndexedVal> Index<V
         k
     }
 }
-
-/// Trait used to translate a stable construct to its rustc counterpart.
-///
-/// This is basically a mirror of [crate::rustc_smir::Stable].
-pub trait RustcInternal {
-    type T<'tcx>;
-    fn internal<'tcx>(&self, tables: &mut Tables<'_>, tcx: TyCtxt<'tcx>) -> Self::T<'tcx>;
-}