Remove in_band_lifetimes from rustc_middle

See #91867

This was mostly straightforward. In several places, I take advantage
of the fact that lifetimes are non-hygenic: a macro declares the
'tcx' lifetime, which is then used in types passed in as macro
arguments.

compiler/rustc_middle/src/traits/mod.rs

@@ -101,7 +101,7 @@ impl<'tcx> fmt::Debug for ObligationCause<'tcx> {
     }
 }
 
-impl Deref for ObligationCause<'tcx> {
+impl<'tcx> Deref for ObligationCause<'tcx> {
     type Target = ObligationCauseData<'tcx>;
 
     #[inline(always)]

compiler/rustc_middle/src/traits/specialization_graph.rs

@@ -216,7 +216,7 @@ impl<'tcx> Ancestors<'tcx> {
 ///
 /// Returns `Err` if an error was reported while building the specialization
 /// graph.
-pub fn ancestors(
+pub fn ancestors<'tcx>(
     tcx: TyCtxt<'tcx>,
     trait_def_id: DefId,
     start_from_impl: DefId,

compiler/rustc_middle/src/traits/structural_impls.rs

@@ -74,7 +74,7 @@ impl<N: fmt::Debug> fmt::Debug for traits::ImplSourceBuiltinData<N> {
     }
 }
 
-impl<N: fmt::Debug> fmt::Debug for traits::ImplSourceTraitUpcastingData<'tcx, N> {
+impl<'tcx, N: fmt::Debug> fmt::Debug for traits::ImplSourceTraitUpcastingData<'tcx, N> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(
             f,