Fix for support of KASLR enabled kernels captured by the SADUMP

dumpfile facility. SADUMP dumpfile headers do not contain phys_base
or VMCOREINFO notes, so without this patch, the crash session fails
during initialization with the message "crash: seek error: kernel
virtual address: <address>  type: "page_offset_base".  This patch
calculates the phys_base value and the KASLR offset using the IDTR
and CR3 registers from the dumpfile header.
(indou.takao@jp.fujitsu.com)

defs.h

@@ -2591,6 +2591,9 @@ struct symbol_table_data {
 	ulong last_section_end;
 	ulong _stext_vmlinux;
 	struct downsized downsized;
+	ulong divide_error_vmlinux;
+	ulong idt_table_vmlinux;
+	ulong saved_command_line_vmlinux;
 };
 
 /* flags for st */
@@ -6312,6 +6315,7 @@ void sadump_set_zero_excluded(void);
 void sadump_unset_zero_excluded(void);
 struct sadump_data;
 struct sadump_data *get_sadump_data(void);
+int sadump_calc_kaslr_offset(ulong *);
 
 /*
  * qemu.c