distinguish recursion limit based overflow for diagnostics

also change the number of allowed fixpoint steps to be fixed instead
of using the `log` of the total recursion depth.

compiler/rustc_trait_selection/src/solve/mod.rs

@@ -42,6 +42,17 @@ pub use fulfill::FulfillmentCtxt;
 pub(crate) use normalize::deeply_normalize_for_diagnostics;
 pub use normalize::{deeply_normalize, deeply_normalize_with_skipped_universes};
 
+/// How many fixpoint iterations we should attempt inside of the solver before bailing
+/// with overflow.
+///
+/// We previously used  `tcx.recursion_limit().0.checked_ilog2().unwrap_or(0)` for this.
+/// However, it feels unlikely that uncreasing the recursion limit by a power of two
+/// to get one more itereation is every useful or desirable. We now instead used a constant
+/// here. If there ever ends up some use-cases where a bigger number of fixpoint iterations
+/// is required, we can add a new attribute for that or revert this to be dependant on the
+/// recursion limit again. However, this feels very unlikely.
+const FIXPOINT_STEP_LIMIT: usize = 8;
+
 #[derive(Debug, Clone, Copy)]
 enum SolverMode {
     /// Ordinary trait solving, using everywhere except for coherence.