[libc] Small performance improvements to GPU allocator Summary: This slightly increases performance in a few places. First, we optimistically assume the cached slab has ample space which lets us avoid the atomic load on the highly contended counter in the case that it is likely to succeed. Second, we no longer call `match_any` twice as we can calculate the uniform slabs at the moment we return them. Thirdly, we always choose a random index on a 32-bit boundary. This means that in the fast case we fulfil the allocation with a single `fetch_or`, and in the other case we quickly move to the free bit. This nets around a 7.75% improvement for the fast path case.
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