[NDS32] Preparation in nds32.h of using registers to save varargs.

  -- The varargs area may also need padding bytes so that we can ensure
     that argument pointer is 8-byte alignment.

	* config/nds32/nds32.h (machine_function): Add some fields for variadic
	arguments implementation.

From-SVN: r214854

gcc/ChangeLog

 2014-09-03  Chung-Ju Wu  <jasonwucj@gmail.com>
 
+	* config/nds32/nds32.h (machine_function): Add some fields for variadic
+	arguments implementation.
+
+2014-09-03  Chung-Ju Wu  <jasonwucj@gmail.com>
+
 	* config/nds32/nds32-predicates.c
 	(nds32_valid_stack_push_pop): Rename to ...
 	(nds32_valid_stack_push_pop_p): ... this.

gcc/config/nds32/nds32.h

@@ -203,18 +203,19 @@ struct GTY(()) machine_function
   /* The padding bytes in callee-saved area may be required.  */
   int callee_saved_area_padding_bytes;
 
-  /* The first required register that should be saved on stack
-     for va_args (one named argument + nameless arguments).  */
-  int va_args_first_regno;
-  /* The last required register that should be saved on stack
-     for va_args (one named argument + nameless arguments).  */
-  int va_args_last_regno;
-
   /* The first required callee-saved register.  */
   int callee_saved_regs_first_regno;
   /* The last required callee-saved register.  */
   int callee_saved_regs_last_regno;
 
+  /* The padding bytes in varargs area may be required.  */
+  int va_args_area_padding_bytes;
+
+  /* The first required register that should be saved on stack for va_args.  */
+  int va_args_first_regno;
+  /* The last required register that should be saved on stack for va_args.  */
+  int va_args_last_regno;
+
   /* Indicate that whether this function needs
      prologue/epilogue code generation.  */
   int naked_p;