Avoid BImode in reload_cse_move2add

[Richard Kenner]

This was one of two kludges that were discussed, felt OK, but I was hoping
to find a better fix.  Since I haven't, I might as well get this in before
the branch.  I again lost my notes on what this fixes, but it was some
Ada ACATS test, I think.

Tested on x86_64-linux-gnu and committed.

2005-11-18  Richard Kenner  <kenner@don.gnat.com>

	* postreload.c (reload_cse_move2add): Don't try to work with BImode.

*** postreload.c	(revision 107176)
--- postreload.c	(working copy)
*************** reload_cse_move2add (rtx first)
*** 1269,1273 ****
  		      validate_change (insn, &SET_SRC (pat), tem, 0);
  		    }
! 		  else
  		    {
  		      enum machine_mode narrow_mode;
--- 1269,1273 ----
  		      validate_change (insn, &SET_SRC (pat), tem, 0);
  		    }
! 		  else if (GET_MODE (reg) != BImode)
  		    {
  		      enum machine_mode narrow_mode;