Strength-reduce per-span division in CentralFreeList::DeallocateSpans. - #725
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Precompute ms_per_cycle = 1000/frequency once outside the lifetime-histogram loop and multiply per span, instead of dividing by frequency each iteration. The legacy TCMALLOC_INTERNAL_LEGACY_LOCKING path is unchanged. PiperOrigin-RevId: 980025504
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Strength-reduce per-span division in CentralFreeList::DeallocateSpans.
Precompute ms_per_cycle = 1000/frequency once outside the lifetime-histogram
loop and multiply per span, instead of dividing by frequency each iteration.
The legacy TCMALLOC_INTERNAL_LEGACY_LOCKING path is unchanged.