* tree-flow.h (register_jump_thread): Pass vector of edges
       instead of each important edge.
       * tree-ssa-threadedge.c (thread_across_edge): Build the jump
       thread path into a vector and pass that to register_jump_thread.
       * tree-ssa-threadupdate.c (register_jump_thread): Conver the
       passed in edge vector to the current 3-edge form.

From-SVN: r201907