[MLIR][Transform][Python] Expose applying named_sequences as a method (#168223)

Makes it so that a NamedSequenceOp can be directly applied to a Module,
via a method `apply(...)`.

mlir/python/mlir/dialects/transform/__init__.py

diff --git a/mlir/python/mlir/dialects/transform/__init__.py b/mlir/python/mlir/dialects/transform/__init__.py
index de414dc..b3dd79c 100644
--- a/mlir/python/mlir/dialects/transform/__init__.py
+++ b/mlir/python/mlir/dialects/transform/__init__.py
@@ -7,6 +7,7 @@
 from .._transform_ops_gen import _Dialect
 from ..._mlir_libs._mlirDialectsTransform import *
 from ..._mlir_libs._mlirDialectsTransform import AnyOpType, OperationType
+from . import interpreter
 
 try:
     from ...ir import *
@@ -324,6 +325,25 @@
     def bodyExtraArgs(self) -> BlockArgumentList:
         return self.body.arguments[1:]
 
+    def apply(
+        self,
+        payload: Module,
+        transform_options: Optional[interpreter.TransformOptions] = None,
+    ) -> Module:
+        assert self.parent
+        assert "transform.with_named_sequence" in self.parent.attributes
+        assert isinstance(
+            self.parent.attributes["transform.with_named_sequence"], UnitAttr
+        )
+
+        interpreter.apply_named_sequence(
+            payload_root=payload,
+            transform_root=self,
+            transform_module=self.parent,
+            transform_options=transform_options,
+        )
+        return payload  # NB: was modified in-place (if any transformation happened)
+
 
 def named_sequence(
     sym_name: Union[str, SymbolRefAttr],

mlir/test/python/dialects/transform_interpreter.py

diff --git a/mlir/test/python/dialects/transform_interpreter.py b/mlir/test/python/dialects/transform_interpreter.py
index 819a3be..ca9ce5d 100644
--- a/mlir/test/python/dialects/transform_interpreter.py
+++ b/mlir/test/python/dialects/transform_interpreter.py
@@ -32,6 +32,20 @@
 
 
 @test_in_context
+def print_self_via_apply_method():
+    m = ir.Module.parse(
+        print_root_module.replace("from interpreter", "print_self_via_apply_method")
+    )
+    m.body.operations[0].apply(m)
+
+
+# CHECK-LABEL: print_self_via_apply_method
+# CHECK: transform.named_sequence @__transform_main
+# CHECK: transform.print
+# CHECK: transform.yield
+
+
+@test_in_context
 def print_other():
     transform = ir.Module.parse(
         print_root_module.replace("from interpreter", "print_other")