regclass.c (init_regs): Add "top_of_stack" as a garbage collection root.

        * regclass.c (init_regs): Add "top_of_stack" as a garbage
        collection root.

From-SVN: r29589

gcc/ChangeLog

@@ -9,6 +9,9 @@ Wed Sep 22 06:25:15 1999  Jim Kingdon  <http://developer.redhat.com>
 
 Wed Sep 22 06:06:57 1999  Jeffrey A Law  (law@cygnus.com)
 
+	* regclass.c (init_regs): Add "top_of_stack" as a garbage
+	collection root.
+
 	* flow.c (record_active_eh_regions): Terminate loop after finding
 	the last insn in the last basic block.
 

gcc/regclass.c

@@ -460,6 +460,7 @@ init_regs ()
     int i;
     for (i = 0; i < MAX_MACHINE_MODE; i++)
       top_of_stack[i] = gen_rtx_MEM (i, stack_pointer_rtx);
+    ggc_add_rtx_root (top_of_stack, MAX_MACHINE_MODE);
   }
 #endif
 }