gh-81057: Move the Allocators to _PyRuntimeState #99217
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The global allocators were stored in 3 static global variables:
_PyMem_Raw,_PyMem, and_PyObject. State for the "small block" allocator was stored in another 13. That makes a total of 16 global variables. We are moving all 16 to the_PyRuntimeStatestruct as part of the work for gh-81057. (If PEP 684 is accepted then we will follow up by moving them all toPyInterpreterState.)