Remove DefId from EarlyParamRegion (clippy/smir)

compiler/rustc_smir/src/rustc_smir/convert/ty.rs

@@ -771,7 +771,6 @@ impl<'tcx> Stable<'tcx> for ty::RegionKind<'tcx> {
         use stable_mir::ty::{BoundRegion, EarlyParamRegion, RegionKind};
         match self {
             ty::ReEarlyParam(early_reg) => RegionKind::ReEarlyParam(EarlyParamRegion {
-                def_id: tables.region_def(todo!()),
                 index: early_reg.index,
                 name: early_reg.name.to_string(),
             }),

compiler/stable_mir/src/ty.rs

@@ -190,7 +190,6 @@ pub(crate) type DebruijnIndex = u32;
 
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct EarlyParamRegion {
-    pub def_id: RegionDef,
     pub index: u32,
     pub name: Symbol,
 }