gh-115491: Keep some fields valid across allocations (free-threading) #115573
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This avoids mimalloc filling the memory occupied by
ob_tid
,ob_ref_local
, andob_ref_shared
with debug bytes (e.g., 0xDD) the free-threaded build.ob_tid
,ob_ref_local
, andob_ref_shared
fields valid across allocations in free-threaded build #115491