[PATCH] Obvious fix to df.c

[Daniel Berlin <dan at cgsoftware dot com>]

Without this, the reaching defs/uses (and therefore, du and ud chains)
are completely wrong.

We weren't adding the successors/preds to the worklist like we should,
we readded the current bb.
Whoops.

Index: df.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/df.c,v
retrieving revision 1.1.2.7
diff -c -3 -p -w -B -b -r1.1.2.7 df.c
*** df.c	2001/07/17 21:40:42	1.1.2.7
--- df.c	2001/07/29 18:17:06
*************** df_rd_global_compute (df, blocks)
*** 1681,1687 ****
  	      if (e->dest == EXIT_BLOCK_PTR)
  		continue;
  	      
! 	      SET_BIT (worklist, i);
  	    }
  	}
      }
--- 1681,1687 ----
  	      if (e->dest == EXIT_BLOCK_PTR)
  		continue;
  	      
! 	      SET_BIT (worklist, e->dest->index);
  	    }
  	}
      }
*************** df_ru_global_compute (df, blocks)
*** 1758,1764 ****
  	      if (e->src == ENTRY_BLOCK_PTR)
  		continue;
  
! 	      SET_BIT (worklist, i);	      
  	    }
  	}
      }
--- 1758,1764 ----
  	      if (e->src == ENTRY_BLOCK_PTR)
  		continue;
  
! 	      SET_BIT (worklist, e->src->index);	      
  	    }
  	}
      }

-- 
"I bought one of those little glass ball things with the snow in
it.  You know, you turn it upside down then you turn it back and
it starts to snow.  I bought one, except this has a snow plow
that does it in rows.
"-Steven Wright