Introduce the Array-based Red-Black Tree macros (ARB): similar to
the traditional tree(3) RB trees, but using an array (preallocated,
linear chunk of memory) to store the tree.
This avoids allocation overhead, improves memory locality,
and makes it trivially easy to share/transfer/copy the entire tree
without the need for marshalling. The downside is that the size
is fixed at initialization time; there is no mechanism to resize
This is one of the dependencies for the new stats(3) framework.
Sponsored By: Klara Inc, Netflix
Obtained from: Netflix