[C API] Remove PyTuple_ClearFreeList() function (move it to the internal C API)

[vstinner]

BPO	40428
Nosy	@vstinner, @ZackerySpytz
PRs	bpo-40428: Remove PyTuple_ClearFreeList() function #19769 bpo-40428: Remove references to Py*_ClearFreeList in the docs #19783 bpo-40428: Cleanup free list part of C API Changes doc #19793

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-04-29.00:29:40.535>
created_at = <Date 2020-04-28.21:04:13.514>
labels = ['expert-C-API', '3.9']
title = '[C API] Remove PyTuple_ClearFreeList() function (move it to the internal C API)'
updated_at = <Date 2020-04-29.14:56:34.216>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-04-29.14:56:34.216>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-04-29.00:29:40.535>
closer = 'vstinner'
components = ['C API']
creation = <Date 2020-04-28.21:04:13.514>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 40428
keywords = ['patch']
message_count = 6.0
messages = ['367561', '367562', '367595', '367596', '367614', '367650']
nosy_count = 2.0
nosy_names = ['vstinner', 'ZackerySpytz']
pr_nums = ['19769', '19783', '19793']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue40428'
versions = ['Python 3.9']

[vstinner]

The following C functions are implementation details and should not be called directly:

• PyAsyncGen_ClearFreeLists()
• PyContext_ClearFreeList()
• PyDict_ClearFreeList()
• PyFloat_ClearFreeList()
• PyFrame_ClearFreeList()
• PyList_ClearFreeList()
• PySet_ClearFreeList()
• PyTuple_ClearFreeList()

To call them all at once, simply call explicitly PyGC_Collect().

Attached PR move these functions to the internal C API and stop to export them.

[vstinner]

Only PyTuple_ClearFreeList() was exported by PC/python3.def.

[vstinner]

New changeset ae00a5a by Victor Stinner in branch 'master':
bpo-40428: Remove PyTuple_ClearFreeList() function (GH-19769)
ae00a5a

[vstinner]

Note: I created this issue while working on bpo-40421, when I moved PyFrame_ClearFreeList() definition from Include/frameobject.h to Include/cpython/frameobject.h.

[vstinner]

New changeset bb4a585 by Zackery Spytz in branch 'master':
bpo-40428: Remove references to Py*_ClearFreeList in the docs (GH-19783)
bb4a585

[vstinner]

New changeset 9a8c131 by Victor Stinner in branch 'master':
bpo-40428: Cleanup free list part of C API Changes doc (GH-19793)
9a8c131