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bpo-37543: optimize pymalloc (python#14674)

PyObject_Malloc() and PyObject_Free() inlines pymalloc_alloc and pymalloc_free partially. But when PGO is not used, compiler don't know where is the hot part in pymalloc_alloc and pymalloc_free.

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-218

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Misc/NEWS.d/next/Core and Builtins
- 2019-07-10-20-33-53.bpo-37543.EvI19D.rst
Objects
- obmalloc.c

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`‎Misc/NEWS.d/next/Core and Builtins/2019-07-10-20-33-53.bpo-37543.EvI19D.rst‎`

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	`1`	`+Optimized pymalloc for non PGO build.`

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