cross from alpha to arm

[Stephen Williams]

This very simple patch allows egcs to successfully build libgcc for the
arm from a Linux/alpha host. I can't say if it fixes the root of the problem,
but it certainly gets me over the immediate hurdle. This seems to be the
only place left where 64bit host --> 32bit arm is confused.

*** egcs-971008/gcc/config/arm/arm.c	Mon Aug 11 08:57:24 1997
--- ../egcs-971008/gcc/config/arm/arm.c	Tue Oct 14 18:31:16 1997
***************
*** 407,412 ****
--- 407,416 ----
  {
    unsigned HOST_WIDE_INT mask = ~0xFF;
  
+ #if HOST_BITS_PER_WIDE_INT > 32
+   if (i & 0xffffffff00000000LL) return FALSE;
+ #endif
+ 
    /* Fast return for 0 and powers of 2 */
    if ((i & (i - 1)) == 0)
      return TRUE;