Sam Gross 587d480203 gh-112529: Remove PyGC_Head from object pre-header in free-threaded build (#114564) ... * gh-112529: Remove PyGC_Head from object pre-header in free-threaded build This avoids allocating space for PyGC_Head in the free-threaded build. The GC implementation for free-threaded CPython does not use the PyGC_Head structure. * The trashcan mechanism uses the `ob_tid` field instead of `_gc_prev` in the free-threaded build. * The GDB libpython.py file now determines the offset of the managed dict field based on whether the running process is a free-threaded build. Those are identified by the `ob_ref_local` field in PyObject. * Fixes `_PySys_GetSizeOf()` which incorrectly incorrectly included the size of `PyGC_Head` in the size of static `PyTypeObject`.		2024-02-01 12:29:19 -08:00
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libpython.py	gh-112529: Remove PyGC_Head from object pre-header in free-threaded build (#114564)	2024-02-01 12:29:19 -08:00