[cfg-branch] var-tracking "future bug" fix

[Josef Zlomek]

Hi,

this patch changes the emiting of notes for the frontier of 2 basic blocks.
When emiting notes for changes between bb1 OUT and bb2 IN sets
the notes are now emited BEFORE bb2->head
This fixes bug that would appear in future when we possibly remove the
NOTE_INSN_BASIC_BLOCK so the bb->head will not have to be a note or
label.

Bootstrapped on i686.

Joe


Sat Apr  6 09:51:01 CEST 2002  Josef Zlomek <zlomek@matfyz.cz>

	* var-traacking (var_tracking_emit_notes): Emit notes BEFORE instead
	of AFTER bb->head.

*** gcc-old/gcc/var-tracking.c	Wed Mar 27 17:02:09 2002
--- gcc-new/gcc/var-tracking.c	Fri Apr  5 20:14:36 2002
*************** var_tracking_emit_notes ()
*** 1130,1136 ****
          }
        /* Emit the notes and delete the marked location parts.  */
        emit_note_data.insn = bb->head;
!       emit_note_data.where = EMIT_NOTE_AFTER_INSN;
        htab_traverse (variable_htab, process_location_parts, &emit_note_data);
  
        /* Emit the notes for the changes in the basic block itself.  */
--- 1130,1136 ----
          }
        /* Emit the notes and delete the marked location parts.  */
        emit_note_data.insn = bb->head;
!       emit_note_data.where = EMIT_NOTE_BEFORE_INSN;
        htab_traverse (variable_htab, process_location_parts, &emit_note_data);
  
        /* Emit the notes for the changes in the basic block itself.  */