[libc] Perform bitfield zero initialization wave-parallel (#143607) Summary: We need to set the bitfield memory to zero because the system does not guarantee zeroed out memory. Even if fresh pages are zero, the system allows re-use so we would need a `kfd` level API to skip this step. Because we can't this patch updates the logic to perform the zero initialization wave-parallel. This reduces the amount of time it takes to allocate a fresh by up to a tenth. This has the unfortunate side effect that the control flow is more convoluted and we waste some extra registers, but it's worth it to reduce the slab allocation latency.
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