Rollup merge of #103865 - compiler-errors:fallback-has-occurred-tracking, r=eholk

Move `fallback_has_occurred` state tracking to `FnCtxt`

Removes a ton of callsites that defaulted to `false`

compiler/rustc_borrowck/src/region_infer/opaque_types.rs

@@ -299,7 +299,7 @@ impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx> {
         if errors.is_empty() {
             definition_ty
         } else {
-            infcx.err_ctxt().report_fulfillment_errors(&errors, None, false);
+            infcx.err_ctxt().report_fulfillment_errors(&errors, None);
             self.tcx.ty_error()
         }
     }