Updating targets.bzl to expose needed schema class defs

Author: BujSet

codegen/targets.bzl

@@ -67,6 +67,18 @@ def define_common_targets():
         ],
     )
 
+    runtime.python_library(
+        name = "exir",
+        srcs = [
+            "_serialize.py",
+            "schema.py",
+        ],
+        base_module = "executorch.exir",
+        visibility = [
+            "//executorch/codegen/...",
+        ],
+    )
+
     runtime.python_binary(
         name = "gen",
         main_module = "executorch.codegen.gen",

codegen/tools/gen_oplist.py

@@ -27,8 +27,8 @@
     # If we build from source, executorch.codegen is not available.
     # We can use relative import instead.
     from ..parse import strip_et_fields
-    from ...exir._serialize import _deserialize_pte_binary
-    from ...exir.schema import (
+    from ..exir._serialize import _deserialize_pte_binary
+    from ..exir.schema import (
         EValue,
         KernelCall,
         OptionalTensorList,