gcse.c (delete_null_pointer_checks_1): Inform caller if any null pointer checks were...

gcse.c (delete_null_pointer_checks_1): Inform caller if any null pointer checks were eliminated.

        * gcse.c (delete_null_pointer_checks_1): Inform caller if any
        null pointer checks were eliminated.  Update prototype.
        (delete_null_pointer_checks): Similarly.
        * rtl.h (delete_null_pointer_checks): Update prototype.
        * toplev.c (rest_of_compilation): Only run cleanup_cfg if
        delete_null_pointer_checks deletes one or more null
        pointer checks.  Do not run cleanup_cfg before gcse, the
        CFG is accurate and optimized at that point..

From-SVN: r54617