Get rid of snap->depth.

src/lj_asm_ppc.h

@@ -1793,8 +1793,8 @@ static void asm_stack_check(ASMState *as, BCReg topslot,
 static void asm_stack_restore(ASMState *as, SnapShot *snap)
 {
   SnapEntry *map = &as->T->snapmap[snap->mapofs];
+  SnapEntry *flinks = &as->T->snapmap[snap_nextofs(as->T, snap)-1];
   MSize n, nent = snap->nent;
-  SnapEntry *flinks = map + nent + snap->depth;
   /* Store the value of all modified slots to the Lua stack. */
   for (n = 0; n < nent; n++) {
     SnapEntry sn = map[n];