add lit test

Author: j2kun

mlir/test/IR/test-pattern-logging-listener.mlir

@@ -0,0 +1,15 @@
+// RUN: mlir-opt %s --test-walk-pattern-rewrite-driver \
+// RUN:   --allow-unregistered-dialect --debug-only=pattern-logging-listener 2>&1 | FileCheck %s
+
+// Check that when replacing an op with a new op, we get appropriate
+// pattern-logging lines
+// CHECK: [pattern-logging-listener] (anonymous namespace)::ReplaceWithNewOp | notifyOperationInserted | test.new_op
+// CHECK: [pattern-logging-listener] (anonymous namespace)::ReplaceWithNewOp | notifyOperationReplaced (with values) | test.replace_with_new_op
+// CHECK: [pattern-logging-listener] (anonymous namespace)::ReplaceWithNewOp | notifyOperationModified | arith.addi
+// CHECK: [pattern-logging-listener] (anonymous namespace)::ReplaceWithNewOp | notifyOperationModified | arith.addi
+// CHECK: [pattern-logging-listener] (anonymous namespace)::ReplaceWithNewOp | notifyOperationErased | test.replace_with_new_op
+func.func @replace_with_new_op() -> i32 {
+  %a = "test.replace_with_new_op"() : () -> (i32)
+  %res = arith.addi %a, %a : i32
+  return %res : i32
+}