fix problem

src/relay/backend/te_compiler.cc

@@ -593,8 +593,9 @@ class LowerTensorExprMutator : public DeviceAwareExprMutator {
   }
 
   Expr DeviceAwareVisitExpr_(const CallNode* call_node) override {
-    ICHECK(call_node->op != CallLoweredOp())
-        << "Found a call_lowered op: can't lower a function that is already lowered.";
+    // Passes before lowering might insert a call_lowered to call a function that has already
+    // been lowered. Therefore we might see call_lowered ops here, but we don't need to do anything
+    // because ResolveToPrimitive returns null for all calls where the call_node->op is an OpNode
     Call call = GetRef<Call>(call_node);
     // Look for (indirect) calls to primitives.
     BaseFunc prim_func = ResolveToPrimitive(call_node->op);