* tree-ssa-threadedge.c (thread_through_normal_block): New argument VISITED.

        Remove VISISTED as a local variable.  When we have a threadable jump, verify
        the destination of the jump has not been visised.
        (thread_across_edge): Allocate VISITED bitmap once at function scope and
        use it throughout.  Make sure to set appropriate bits in VISITED for E (start
        of jump thread path).

        * tree-ssa-threadupdate.c (mark_threaded_blocks): Reject threading through
        a joiner if any edge on the path has a recorded jump thread.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@203895 138bc75d-0d04-0410-961f-82ee72b054a4

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