| Setup initial specialization infrastructure for the ``CALL_FUNCTION`` opcode. | |
| Implemented initial specializations for C function calls: | |
| * ``CALL_FUNCTION_BUILTIN_O`` for ``METH_O`` flag. | |
| * ``CALL_FUNCTION_BUILTIN_FAST`` for ``METH_FASTCALL`` flag without keywords. | |
| * ``CALL_FUNCTION_LEN`` for ``len(o)``. | |
| * ``CALL_FUNCTION_ISINSTANCE`` for ``isinstance(o, t)``. |