Auto-port 5.0: Remove reference counting from size classed chunks#16378
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Motivation: SizeClassedChunk performs 2 atomic ops (retain/release) per allocation cycle on the hot path. Modification: Replace ref counting with a segment-count state machine that only needs atomics on the cold deallocation path. Result: No more per-allocation atomic operations for SizeClassedChunk. (cherry picked from commit de25e7a)
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Auto-port of #16306 to 5.0
Cherry-picked commit: de25e7a
Motivation:
SizeClassedChunk performs 2 atomic ops (retain/release) per allocation cycle on the hot path.
Modification:
Replace ref counting with a segment-count state machine that only needs atomics on the cold deallocation path.
Result:
No more per-allocation atomic operations for SizeClassedChunk.