Move the unexported private functions to the internal C API: * pycore_frame.h: _PyFrame_New_NoTrack() * pycore_function.h: _PyFunction_GetVersionForCurrentState() * pycore_genobject.h: _PyAsyncGenValueWrapperNew() * pycore_genobject.h: _PyCoro_GetAwaitableIter() * pycore_genobject.h: _PyGen_yf()
* Make internal APIs that take PyFrameConstructor take a PyFunctionObject instead. * Add reference to function to frame, borrow references to builtins and globals. * Add COPY_FREE_VARS instruction to allow specialization of calls to inner functions.