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098a6a5f - Add check_positional/no_positional arg helpers mirroring CPython (#191361)

Add check_positional/no_positional arg helpers mirroring CPython (#191361) Summary: Introduce check_positional and no_positional in torch/_dynamo/utils.py, the Python analogs of CPython's _PyArg_CheckPositional and _PyArg_NoPositional (Python/getargs.c). tp_methods arity is otherwise enforced by MethodFlags derived from a method's ml_flags, but METH_FASTCALL carries no positional min/max (it maps to VARARGS), so handlers hand-rolled those checks via raise_args_mismatch, whose message diverges from eager. These helpers raise CPython's exact TypeError text and are consumed by the FASTCALL handlers migrated in the following commits. X-link: https://github.com/pytorch/pytorch/pull/191361 Approved by: https://github.com/hameerabbasi ghstack dependencies: #190971 Reviewed By: huydhn Differential Revision: D114083586 fbshipit-source-id: a65431d3e32aaaf1709be2007ae954130a797ec8