Bug 597618: add a max loop iteration count for pkix_BuildForwardDepthFirstSearch.  r=alexei,rrelyea.
Bug 597618: add a max loop iteration count for
pkix_BuildForwardDepthFirstSearch.  r=alexei,rrelyea.

ekr/nss-old,nmav/nss,nmav/nss,nmav/nss,ekr/nss-old,ekr/nss-old,ekr/nss-old,ekr/nss-old,nmav/nss,nmav/nss,nmav/nss,nmav/nss,ekr/nss-old,ekr/nss-old