[PATCH v4] malloc: send freed small chunks to smallbin

[Florian Weimer]

* Carlos O'Donell:

> On 10/31/24 2:47 PM, k4lizen wrote:
>> Large chunks get added to the unsorted bin since
>> sorting them takes time, for small chunks the
>> benefit of adding them to the unsorted bin is
>> non-existant, actually hurting performance.
>> 
>> Splitting and malloc_consolidate still add small
>> chunks to unsorted, but we can hint the compiler
>> that that is a relatively rare occurance.
>> Benchmarking shows this to be consistently good.
>> 
>> Signed-off-by: k4lizen <k4lizen@proton.me>
>
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Thanks,
Florian