[IA64] point saved_max_pfn to the max_pfn of the entire system

Make saved_max_pfn point to max_pfn of entire system.

Without this patch is so that vmcore is zero length on ia64.  This is
because saved_max_pfn was wrongly being set to the max_pfn of the crash
kernel's address space, rather than the max_pfg on the physical memory of
the machine - the whole purpose of vmcore is to access physical memory that
is not part of the crash kernel's addresss space.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
Sort-Of-Acked-By: Jay Lan <jlan@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/mm/discontig.c

@@ -480,12 +480,6 @@ void __init find_memory(void)
 	max_pfn = max_low_pfn;
 
 	find_initrd();
-
-#ifdef CONFIG_CRASH_DUMP
-	/* If we are doing a crash dump, we still need to know the real mem
-	 * size before original memory map is reset. */
-        saved_max_pfn = max_pfn;
-#endif
 }
 
 #ifdef CONFIG_SMP