[PATCH] Fix PR16360

[Michael Liao]

Ping with patch reattached. - Michael

On Wed, 2013-06-19 at 10:14 -0700, Michael Liao wrote:
> Hi,
> 
> The attached patch fixes PR16360. In DAG combining, when (srl (anyextend
> x), c) is folded into (anyextend (srl x, c)), the high bits are not
> cleared. That makes such transformation too aggressive and generates
> wrong code. The fix will 'and' a constant mask after 'anyextend', i.e.
> folding from (srl (anyextend x), c) to (and (anyextend (srl x, c)),
> mask).
> 
> Thanks of review
> - Michael
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