mode_mask_array not initialized for EXTRA_CC_MODES

[Richard Earnshaw <rearnsha at arm dot com>]

The recent change to add mode_mask_array doesn't initialize the array for 
EXTRA_CC_MODES -- these are then used by nonzero_bits and like functions, 
but contain garbage, causing the ARM port to perform incorrect 
optimizations.  Patch below:

<date> Richard Earnshaw <rearnsha@arm.com>

	* machmode.h (mode_mask_array): No longer const.
	* rtl.c (init_rtl): Fully initialize it if EXTRA_CC_MODES defined.


Index: machmode.h
===================================================================
RCS file: /egcs/carton/cvsfiles/egcs/gcc/machmode.h,v
retrieving revision 1.6
diff -p -r1.6 machmode.h
*** machmode.h	1998/10/09 15:50:23	1.6
--- machmode.h	1998/10/20 16:07:31
*************** extern int mode_unit_size[];
*** 196,202 ****
  /* Get a bitmask containing 1 for all bits in a word
     that fit within mode MODE.  */
  
! extern const unsigned HOST_WIDE_INT mode_mask_array[];
  
  #define GET_MODE_MASK(MODE) mode_mask_array[(int) (MODE)]
  
--- 196,202 ----
  /* Get a bitmask containing 1 for all bits in a word
     that fit within mode MODE.  */
  
! extern unsigned HOST_WIDE_INT mode_mask_array[];
  
  #define GET_MODE_MASK(MODE) mode_mask_array[(int) (MODE)]
  
Index: rtl.c
===================================================================
RCS file: /egcs/carton/cvsfiles/egcs/gcc/rtl.c,v
retrieving revision 1.21
diff -p -r1.21 rtl.c
*** rtl.c	1998/10/14 10:37:05	1.21
--- rtl.c	1998/10/20 16:07:31
*************** unsigned char mode_wider_mode[(int) MAX_
*** 122,128 ****
  
  /* Indexed by machine mode, gives mask of significant bits in mode.  */
  
! const unsigned HOST_WIDE_INT mode_mask_array[(int) MAX_MACHINE_MODE] = {
  #include "machmode.def"
  };
  
--- 122,128 ----
  
  /* Indexed by machine mode, gives mask of significant bits in mode.  */
  
! unsigned HOST_WIDE_INT mode_mask_array[(int) MAX_MACHINE_MODE] = {
  #include "machmode.def"
  };
  
*************** init_rtl ()
*** 901,906 ****
--- 901,907 ----
    for (i = (int) CCmode + 1; i < (int) MAX_MACHINE_MODE; i++)
      {
        mode_class[i] = MODE_CC;
+       mode_mask_array[i] = mode_mask_array[(int) CCmode];
        mode_size[i] = mode_size[(int) CCmode];
        mode_unit_size[i] = mode_unit_size[(int) CCmode];
        mode_wider_mode[i - 1] = i;