[tree-ssa] Fix bug in bsi_insert_on_edge.

[Andrew MacLeod]

When splitting an edge, we weren't marking the new edge as a fallthru
edge. This was causing PRE to blow up since we'd create something like:

if (a_18 != 0)
    {
# BLOCK 21.  PRED: 8.  SUCC: 9.
      pretmp.12_32 = T.1_4 >> 2;

# BLOCK 9.  PRED: 21 18.  SUCC: 11 10.
      <U3488>:;;

and the edge from 8 to 9 wouldn't be marked as FALLTHRU. 

Commited.


Andrew




	* tree-cfg.c (tree_split_edge): Mark edge as FALLTHRU when splitting.

Index: tree-cfg.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/Attic/tree-cfg.c,v
retrieving revision 1.1.4.172
diff -c -p -r1.1.4.172 tree-cfg.c
*** tree-cfg.c	26 Sep 2003 13:08:48 -0000	1.1.4.172
--- tree-cfg.c	6 Oct 2003 14:26:47 -0000
*************** tree_split_edge (edge edge_in)
*** 4543,4549 ****
    new_bb = create_bb ();
    create_block_annotation (new_bb);
    redirect_edge_succ  (edge_in, new_bb);
!   new_edge = make_edge (new_bb, dest, 0);
  
    /* Find all the PHI arguments on the original edge, and change them to
       the new edge.  */
--- 4543,4549 ----
    new_bb = create_bb ();
    create_block_annotation (new_bb);
    redirect_edge_succ  (edge_in, new_bb);
!   new_edge = make_edge (new_bb, dest, EDGE_FALLTHRU);
  
    /* Find all the PHI arguments on the original edge, and change them to
       the new edge.  */