[RFA] Change enable_thread_stack_temporaries to an RAII class

[Simon Marchi]

Oops, forgot this one:

On 2018-03-08 12:35 AM, Tom Tromey wrote:
> @@ -810,29 +771,26 @@ push_thread_stack_temporary (ptid_t ptid, struct value *v)
>    struct thread_info *tp = find_thread_ptid (ptid);
>  
>    gdb_assert (tp != NULL && tp->stack_temporaries_enabled);
> -  VEC_safe_push (value_ptr, tp->stack_temporaries, v);
> +  tp->stack_temporaries.push_back (v);
>  }
>  
> -/* Return 1 if VAL is among the stack temporaries of the thread
> -   with id PTID.  Return 0 otherwise.  */
> +/* Return true if VAL is among the stack temporaries of the thread
> +   with id PTID.  Return false otherwise.  */
>  
> -int
> +bool
>  value_in_thread_stack_temporaries (struct value *val, ptid_t ptid)
>  {
>    struct thread_info *tp = find_thread_ptid (ptid);
>  
>    gdb_assert (tp != NULL && tp->stack_temporaries_enabled);
> -  if (!VEC_empty (value_ptr, tp->stack_temporaries))
> +  if (!tp->stack_temporaries.empty ())
>      {
> -      struct value *v;
> -      int i;
> -
> -      for (i = 0; VEC_iterate (value_ptr, tp->stack_temporaries, i, v); i++)
> +      for (struct value *v : tp->stack_temporaries)
>  	if (v == val)
> -	  return 1;
> +	  return true;

The "if (!tp->stack_temporaries.empty ())" here is now unnecessary.

Simon