loop-invariant.c patch: Use validate_change to avoid breaking match_dup

[Eric Botcazou]

> I think I see what you mean.  Please go ahead with your patch then.

Thanks.  Here's what I've installed after testing on x86_64-suse-linux.


2010-04-09  Eric Botcazou  <ebotcazou@adacore.com>
            Bernd Schmidt  <bernd.schmidt@codesourcery.com>

	* loop-invariant.c (replace_uses): New static function.
	(move_invariant_reg): Use it to ensure we can replace the uses.


-- 
Eric Botcazou
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