Enumerate URIs of all types in type errors in order to help the user diagnose

runtime/vm/aot_optimizer.cc

Index: runtime/vm/aot_optimizer.cc
diff --git a/runtime/vm/aot_optimizer.cc b/runtime/vm/aot_optimizer.cc
index 49f9f18d17d036a6620083d20a78ed6f602758ca..102cf96df2c188b50aee9029c3b9253167a73660 100644
--- a/runtime/vm/aot_optimizer.cc
+++ b/runtime/vm/aot_optimizer.cc
@@ -2386,14 +2386,12 @@ void AotOptimizer::ReplaceWithTypeCast(InstanceCallInstr* call) {
       return;
     }
   }
-  const String& dst_name = String::ZoneHandle(Z,
-      Symbols::New(Exceptions::kCastErrorDstName));
   AssertAssignableInstr* assert_as =
       new(Z) AssertAssignableInstr(call->token_pos(),
                                    new(Z) Value(left),
                                    new(Z) Value(type_args),
                                    type,
-                                   dst_name,
+                                   Symbols::InTypeCast(),
                                    call->deopt_id());
   ReplaceCall(call, assert_as);
 }