more fixes for garbage collector

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1394 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

C/save.c

@@ -417,6 +417,7 @@ save_regs(int mode)
 #ifdef  DEPTH_LIMIT
     putout(DEPTH);
 #endif
+    putout(GcGeneration);
   }
   /* The operand base */
   putcellptr(CellPtr(XREGS));
@@ -812,6 +813,9 @@ get_regs(int flag)
     if (Yap_ErrorMessage)
       return -1;
 #endif
+    GcGeneration = get_cell();
+    if (Yap_ErrorMessage)
+      return -1;
   }
   /* Get the old bases */
   OldXREGS = get_cellptr();