Use CRATE_HIR_ID instead of DUMMY_HIR_ID when appropriate.

Those usage ends up forwarded to a `ObligationClause` which uses
`CRATE_HIR_ID` for dummy value as seen in `ObligationClause::dummy`.

Author: marmeladema

src/librustc_traits/implied_outlives_bounds.rs

@@ -62,7 +62,7 @@ fn compute_implied_outlives_bounds<'tcx>(
         // unresolved inference variables here anyway, but there might be
         // during typeck under some circumstances.)
         let obligations =
-            wf::obligations(infcx, param_env, hir::DUMMY_HIR_ID, ty, DUMMY_SP).unwrap_or(vec![]);
+            wf::obligations(infcx, param_env, hir::CRATE_HIR_ID, ty, DUMMY_SP).unwrap_or(vec![]);
 
         // N.B., all of these predicates *ought* to be easily proven
         // true. In fact, their correctness is (mostly) implied by

src/librustc_ty/ty.rs

@@ -265,7 +265,7 @@ fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> {
     let unnormalized_env =
         ty::ParamEnv::new(tcx.intern_predicates(&predicates), traits::Reveal::UserFacing, None);
 
-    let body_id = tcx.hir().as_local_hir_id(def_id).map_or(hir::DUMMY_HIR_ID, |id| {
+    let body_id = tcx.hir().as_local_hir_id(def_id).map_or(hir::CRATE_HIR_ID, |id| {
         tcx.hir().maybe_body_owned_by(id).map_or(id, |body| body.hir_id)
     });
     let cause = traits::ObligationCause::misc(tcx.def_span(def_id), body_id);

src/librustc_typeck/check/method/probe.rs

@@ -452,7 +452,7 @@ fn method_autoderef_steps<'tcx>(
     tcx.infer_ctxt().enter_with_canonical(DUMMY_SP, &goal, |ref infcx, goal, inference_vars| {
         let ParamEnvAnd { param_env, value: self_ty } = goal;
 
-        let mut autoderef = Autoderef::new(infcx, param_env, hir::DUMMY_HIR_ID, DUMMY_SP, self_ty)
+        let mut autoderef = Autoderef::new(infcx, param_env, hir::CRATE_HIR_ID, DUMMY_SP, self_ty)
             .include_raw_pointers()
             .silence_errors();
         let mut reached_raw_pointer = false;