Auto merge of #81055 - matthewjasper:non-fatal-overflow, r=nikomatsakis

Make hitting the recursion limit in projection non-fatal

This change was originally made in #80246 to avoid future (effectively) infinite loop bugs in projections,
but wundergraph relies on rustc recovering here.

cc #80953

r? `@nikomatsakis`

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

@@ -291,10 +291,6 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         self.infcx.tcx
     }
 
-    pub(super) fn query_mode(&self) -> TraitQueryMode {
-        self.query_mode
-    }
-
     ///////////////////////////////////////////////////////////////////////////
     // Selection
     //