Florian Weimer 71effcea34 malloc: Revert fastbins to old-style atomics
Commit 6923f6db1e688dedcf3a6556da76e0bf24a41872 ("malloc: Use current
(C11-style) atomics for fastbin access") caused a substantial
performance regression on POWER and Aarch64, and the old atomics,
while hard to prove correct, seem to work in practice.
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