cdd3d54bce
The rbtnode->rpz flag was left behind when rbt and rpz were disentangled by CHANGES #4576. Removing it makes the comment above correct again. This reduces the flags so they fit in a 32 bit word again. On 64 bit systems there is still padding so it doesn't change the size of an rbtnode. On 32 bit systems it reduces an rbtnode by 4 bytes.