tree 17cd54e917313f0dad211cb49aee497011ab2b6e
parent 3417a304ccde61ac1f68b436ec22c03f1d6824ec
author Jason Evans <je@fb.com> 1456280844 -0800
committer Jason Evans <je@fb.com> 1456280844 -0800

Collapse arena_avail_tree_* into arena_run_tree_*.

These tree types converged to become identical, yet they still had
independently generated red-black tree implementations.