[RL78] Questions about code-generation

[Oleg Endo]

On Sun, 2014-03-16 at 17:22 -0400, DJ Delorie wrote:
> This is similar to what I had to do for msp430 - I made a new
> constraint that was what general_operand would have done if it allowed
> volatile MEMs, and used that for instructions where a volatile's
> volatileness wouldn't be broken.

Maybe we should add a target hook/macro to control this to avoid
duplicated code of 'general_operand' in various places?

Cheers,
Oleg