Address reflection for variables is broken

[asutton]

The value printed by the following function is garbage.

int var = 42;
int main() {
  constexpr variable_info v = reflexpr(var);
  printf("%d\n", v.get<int>());
}

[asutton]

I think this might be computing the symbol address and then dereferencing that. We probably want to extract the variable or string computed by the immediate call and then return the address of that object.