[RFC/RFA] gdb.cp/classes.exp: Don't try to print local variable out of scope

[Andrew Cagney]

> 1 void foo ()
>   2 {
>   3   int i = 1;
>   4   {
>   5     int i = 2;
>   6     bar(i);
>   7   }
>   8   bar (i);
>   9 }
> 
> cv> Is line 7 still in the scope of the inner definition of variable `i'?
> cv> Which `i' should be printed at that point?
> 
> My intuition says that the inner "i" is in scope at line 7.

Yes, the inner "i" should be in scope.  That line, which hasn't yet been 
executed, will destory the inner block.  I think that is covered by the 
GCC-O0 rule?

Andrew