[libc] Increase the number of times we wait on a slab
Summary:
This wait restricts how long we wait on a slab. The only reason this
isn't an infinite loop is to prevent complete deadlocks. However, this
limit was *just* on the cusp of waiting long enough for the allocation
to be done. Just increase this to a sufficiently large value, because
this limit only exists to keep the interface wait-free in the absolute
worst case scheduling scenario. This *MASSIVELY* improved performance
for mixed allocations as we no longer shuffled around creating more than
necessary.
