[mlir][doc] Fix transform dialect tutorial ch3 (#150456)

Fixed some bugs in documentation. Add CallOpInterfaceHandle to the
arguments of ChangeCallTargetOp, after doing so the section described in
the documentation works correctly, Otherwise the following code reports
an error.
```
// Cast to our new type.
 %casted = transform.cast %call : !transform.any_op to !transform.my.call_op_interface
// Using our new operation.
 transform.my.change_call_target %casted, "microkernel" : !transform.my.call_op_interface
```

Author: linuxlonelyeagle

mlir/docs/Tutorials/transform/Ch3.md

@@ -139,7 +139,21 @@ void MyExtension::init() {
 ```
 
 This type is now directly available in the Transform dialect and can be used in operations.
+In the previous tablegen definition, the type of `$call` must be `Transform_ConcreteOp<“func.call”>`,
+By adding `CallOpInterfaceHandle` as an allowed type for `$call`, the corresponding handle
+is allowed to be to any op implementing the interface.
 
+```tablegen
+def ChangeCallTargetOp : ... {
+    let arguments = (ins
+    // Allow the handle to be to concrete `func.call` ops as well as any op implementing
+    // the `CallOpInterface`.
+    AnyTypeOf<[Transform_ConcreteOpType<"func.call">, CallOpInterfaceHandle]>:$call,
+    StrAttr:$new_target); 
+}
+```
+
+We can then add the following code to `sequence.mlir` and run it with the interpreter.
 
 ```mlir
   // Cast to our new type.
@@ -172,7 +186,7 @@ def CallToOp : Op<Transform_Dialect, "my.call_to_op",
   let results = (outs TransformHandleTypeInterface:$transformed);
 
   // Provide nice syntax.
-  let assemblyFormat = "$call attr-dict `:` functional-type(inputs, outputs)";
+  let assemblyFormat = "$call attr-dict `:` functional-type(operands, results)";
 
   // Declare the function implementing the interface for a single payload operation.
   let extraClassDeclaration = [{

mlir/examples/transform/Ch3/include/MyExtension.td

@@ -46,9 +46,9 @@ def ChangeCallTargetOp : Op<Transform_Dialect, "my.change_call_target",
   // We use a string attribute as the symbol may not exist in the transform IR so the 
   // verification may fail. 
   let arguments = (ins
-    // Specify the type constraint on the input accepting only `func.call` payload
-    // operations.
-    Transform_ConcreteOpType<"func.call">:$call,
+    // Allow the handle to be to concrete func.call ops as well as any op implementing
+    // the CallOpInterface.
+    AnyTypeOf<[Transform_ConcreteOpType<"func.call">, CallOpInterfaceHandle]>:$call,
     StrAttr:$new_target);
 
   // The results are empty as the transformation does not produce any new payload.

mlir/test/Examples/transform/Ch3/ops.mlir

@@ -30,9 +30,30 @@ module attributes {transform.with_named_sequence} {
 // -----
 
 func.func private @orig()
+func.func private @updated()
 
 // CHECK-LABEL: func @test2
 func.func @test2() {
+  // CHECK: call @updated
+  call @orig() : () -> ()
+  return
+}
+
+module attributes {transform.with_named_sequence} {
+  transform.named_sequence @__transform_main(%arg0: !transform.any_op) {
+    %call = transform.structured.match ops{["func.call"]} in %arg0 : (!transform.any_op) -> !transform.my.call_op_interface
+    // CHECK: transform.my.change_call_target %{{.*}}, "updated" : !transform.my.call_op_interface
+    transform.my.change_call_target %call, "updated" : !transform.my.call_op_interface
+    transform.yield
+  }
+}
+
+// -----
+
+func.func private @orig()
+
+// CHECK-LABEL: func @test3
+func.func @test3() {
   // CHECK: "my.mm4"
   call @orig() : () -> ()
   return

mlir/test/Examples/transform/Ch3/sequence.mlir

@@ -101,11 +101,12 @@ module attributes {transform.with_named_sequence} {
     %_1, %outline_target = transform.structured.fuse_into_containing_op %matmul_fused_2 into %loop_third
         : (!transform.any_op, !transform.any_op) -> (!transform.any_op, !transform.any_op)
     %func, %call = transform.loop.outline %outline_target {func_name = "outlined"}
-        : (!transform.any_op) -> (!transform.any_op, !transform.op<"func.call">)
-  
-    // Rewrite the call target.
-    transform.my.change_call_target %call, "microkernel" : !transform.op<"func.call">
-  
+        : (!transform.any_op) -> (!transform.any_op, !transform.any_op)
+    // Cast to our new type.
+    %casted = transform.cast %call : !transform.any_op to !transform.my.call_op_interface
+    // Using our new operation.
+    transform.my.change_call_target %casted, "microkernel" : !transform.my.call_op_interface
+
     transform.yield
   }
 }