mypy

5d2ea169 - [mypyc] Use faster METH_FASTCALL wrapper functions on Python 3.7+ (#9894)

[mypyc] Use faster METH_FASTCALL wrapper functions on Python 3.7+ (#9894) Implement faster argument parsing based on METH_FASTCALL on supported Python versions. Use `vgetargskeywordsfast` extracted from Python 3.9 with some modifications: * Support required keyword-only arguments, `*args` and `**kwargs` * Only support the 'O' type (to reduce code size and speed things up) The modifications are very similar to what we have in the old-style argument parsing logic. The legacy calling convention is still used for `__init__` and `__call__`. I'll add `__call__` support in a separate PR. I haven't looked into supporting `__init__` yet. Here are some benchmark results (on Python 3.8) * keyword_args_from_interpreted: 3.5x faster than before * positional_args_from_interpreted: 1.4x faster than before However, the above benchmarks are still slower when compiled. I'll continue working on further improvements after this PR. Fixes mypyc/mypyc#578.