Auto merge of #118685 - compiler-errors:stack-dependent, r=lcnr

`EvaluatedToUnknown` -> `EvaluatedToAmbigStackDependent`, `EvaluatedToRecur` -> `EvaluatedToErrStackDependent`

Less confusing names, since the only difference between them and their parallel `EvalutedTo..` is that they are stack dependent.

r? lcnr

compiler/rustc_trait_selection/src/traits/select/mod.rs

@@ -222,8 +222,8 @@ pub enum TreatInductiveCycleAs {
 impl From<TreatInductiveCycleAs> for EvaluationResult {
     fn from(treat: TreatInductiveCycleAs) -> EvaluationResult {
         match treat {
-            TreatInductiveCycleAs::Ambig => EvaluatedToUnknown,
-            TreatInductiveCycleAs::Recur => EvaluatedToRecur,
+            TreatInductiveCycleAs::Ambig => EvaluatedToAmbigStackDependent,
+            TreatInductiveCycleAs::Recur => EvaluatedToErrStackDependent,
         }
     }
 }
@@ -1231,7 +1231,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             })
         {
             debug!("evaluate_stack --> unbound argument, recursive --> giving up",);
-            return Ok(EvaluatedToUnknown);
+            return Ok(EvaluatedToAmbigStackDependent);
         }
 
         match self.candidate_from_obligation(stack) {