Issue #28915: Replace _PyObject_CallMethodId() with
_PyObject_CallMethodIdObjArgs() when the format string was only made of "O"
formats, PyObject* arguments.

_PyObject_CallMethodIdObjArgs() avoids the creation of a temporary tuple and
doesn't have to parse a format string.

Issue #28915: Replace _PyObject_CallMethodId() with
_PyObject_CallMethodIdObjArgs() when the format string was only made of "O"
formats, PyObject* arguments.

_PyObject_CallMethodIdObjArgs() avoids the creation of a temporary tuple and
doesn't have to parse a format string.

Issue #28915: Replace _PyObject_CallMethodId() with
_PyObject_CallMethodIdObjArgs() in unpickle(). _PyObject_CallMethodIdObjArgs()
avoids the creation of a temporary tuple and doesn't have to parse a format
string.

Replace _PyObject_CallMethodId() with _PyObject_GetAttrId()+PyObject_Call() for
the second call since it requires to "unpack" a tuple.

Add also a check in the type of the second parameter (state): it must be a
tuple.

Issue #28915.

Issue #28915: Replace _PyObject_CallMethodId() with
_PyObject_CallMethodIdObjArgs() when the format string was only made of "O"
formats, PyObject* arguments.

_PyObject_CallMethodIdObjArgs() avoids the creation of a temporary tuple and
doesn't have to parse a format string.

Replace PyObject_CallFunction(func, NULL) with _PyObject_CallNoArg(func).

when the grp module cannot be imported, as for example on Android platforms.

Issue #28915: Replace Py_VaBuildValue()+PyObject_Call() with
_PyObject_FastCallVa() to avoid the creation of temporary tuple.

Issue #28915: Similar to _PyObject_CallFunctionObjArgs() but use va_list to
pass arguments.

Issue #28915: Use PyObject_Call() to pass a tuple of positional arguments,
instead of relying on _PyObject_CallMethodId() weird behaviour to unpack the
tuple.

Issue #28915: Avoid calling _PyObject_CallMethodId() with "(...)" format to
avoid the creation of a temporary tuple: use Py_BuildValue() with
_PyObject_CallMethodIdObjArgs().

Issue #28915: Replace _PyObject_CallMethodId() with
_PyObject_CallMethodIdObjArgs() when the format string only use the format 'O'
for objects, like "(O)".

_PyObject_CallMethodIdObjArgs() avoids the code to parse a format string and
avoids the creation of a temporary tuple.

Issue #28915: Without parenthesis, _PyObject_CallMethodId() avoids the creation
a temporary tuple, and so is more efficient.

Issue #28915: Use _Py_VaBuildStack() to build a C array of PyObject* and then
use _PyObject_FastCall().

The function has a special case if the stack only contains one parameter and
the parameter is a tuple: "unpack" the tuple of arguments in this case.

Issue #28915: Similar to Py_VaBuildValue(), but work on a C array of PyObject*,
instead of creating a tuple.

Issue #28915: Py_ssize_t type is better for indexes. The compiler might emit
more efficient code for i++. Py_ssize_t is the type of a PyTuple index for
example.

Replace also "int endchar" with "char endchar".

Issue #28915.

Issue #28915: Add _PyObject_CallFunctionVa() helper to factorize code of
functions:

* PyObject_CallFunction()
* _PyObject_CallFunction_SizeT()
* callmethod()

Issue #28915: Add _PyObject_FastCallVa() helper to factorize code of functions:

* PyObject_CallFunctionObjArgs()
* PyObject_CallMethodObjArgs()
* _PyObject_CallMethodIdObjArgs()

Inline objargs_mkstack() into _PyObject_FastCallVa(), remove
objargs_mkstack().

test_functools hanging on the Android armv7 qemu emulator.