Minor update to validate_replace_rtx

[Geoff Keating]

kenner@vlsi1.ultra.nyu.edu (Richard Kenner) writes:

> It should also update the last two args of a ZERO_EXTRACT in a SET_DEST,
> but doesn't.  I doubt this actually affects anything, but it's wrong.

Hi Richard,

* You didn't say on which platform you tested this patch.
* As the diff output indicates, you changed validate_replace_src rather than
  validate_replace_rtx.

-- 
- Geoffrey Keating <geoffk@geoffk.org>