[issue28839] _PyFunction_FastCallDict(): replace PyTuple_New() with PyMem_Malloc()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I agree with Josh, PyTuple_New() can be faster than PyMem_Malloc() due to tuple free list. small_stack increases C stack consumption even for calls without keyword arguments. This is serious problem since we can't control stack overflow.

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<http://bugs.python.org/issue28839>
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