[issue29507] Use FASTCALL in call_method() to avoid temporary tuple

[STINNER Victor]

STINNER Victor added the comment:

method_fastcall4.patch: Based on method_fastcall3.patch, I just added call_unbound() and call_unbound_noarg() helper functions to factorize code. I also modified mro_invoke() to be able to remove lookup_method().

I confirm the speedup with attached bench.py:

Median +- std dev: [ref] 121 ns +- 5 ns -> [patch] 82.8 ns +- 1.0 ns: 1.46x faster (-31%)

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Added file: http://bugs.python.org/file46611/method_fastcall4.patch

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