PATCH to gimplify_modify_expr to avoid extra copies

[Jason Merrill]

On Thu, 10 Jun 2004 23:05:53 -0400, Jason Merrill <jason@redhat.com> wrote:

> Brian, can you make sure that my comment about V_MAY_DEF is accurate when
> you check in your patch?  :)
>
> ! 	/* Don't force a temp of a large aggregate type; the copy could be
> ! 	   arbitrarily expensive.  Instead we will generate a V_MAY_DEF for
> ! 	   the assignment.  */;

Ah, I see you already checked it in.  Does something like this make sense
to you?

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