sh: Add die chain notifiers.

Add the atomic die chains in, kprobes needs these.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

include/asm-sh/system.h

@@ -9,6 +9,7 @@
 #include <linux/irqflags.h>
 #include <linux/compiler.h>
 #include <asm/types.h>
+#include <asm/ptrace.h>
 
 /*
  *	switch_to() should switch tasks to task nr n, first
@@ -255,6 +256,8 @@ static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
 				    (unsigned long)_n_, sizeof(*(ptr))); \
   })
 
+extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
+
 extern void *set_exception_table_vec(unsigned int vec, void *handler);
 
 static inline void *set_exception_table_evt(unsigned int evt, void *handler)