Add last_fault_code used in pmap-v6.c if kernel is compiled with "option DEBUG"

sys/arm/arm/trap-v6.c

@@ -67,6 +67,10 @@ __FBSDID("$FreeBSD$");
 
 extern char fusubailout[];
 
+#ifdef DEBUG
+int last_fault_code;	/* For the benefit of pmap_fault_fixup() */
+#endif
+
 struct ksig {
 	int sig;
 	u_long code;
@@ -457,6 +461,10 @@ abort_handler(struct trapframe *tf, int prefetch)
 	if (prefetch)
 		ftype |= VM_PROT_EXECUTE;
 
+#ifdef DEBUG
+	last_fault_code = fsr;
+#endif
+
 #ifndef ARM_NEW_PMAP
 	if (pmap_fault_fixup(vmspace_pmap(td->td_proc->p_vmspace), va, ftype,
 	    usermode)) {