S4884 should not run an infinite loop when several paragraphs use the same name

The implementation of RSPEC-4884 (Paragraphs used by a "PERFORM" statement should not contain "GO TO") should not run an infinite loop when several paragraphs have the same name. Example:

       IDENTIFICATION  DIVISION.
       PROCEDURE DIVISION.

       perform p1 thru p4.
       goback.

       p1.
       p2.
       p3.
       p2.
       p4.