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.
HorusLi522 · Jul 17, 2019 · fb26504 · fb26504
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diff --git a/Misc/NEWS.d/next/Core and Builtins/2019-07-10-20-33-53.bpo-37543.EvI19D.rst b/Misc/NEWS.d/next/Core and Builtins/2019-07-10-20-33-53.bpo-37543.EvI19D.rst
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+Optimized pymalloc for non PGO build.