* ifcvt.c (find_cond_trap): Handle cases with no proper THEN or JOIN
        blocks.  Handle multiple references to the TRAP block.  Handle
        non-adjacent THEN and OTHER blocks.

        * gcc.dg/20000906-1.c: Enable for all targets.
        * gcc.c-torture/compile/iftrap-2.c: New.

From-SVN: r52509