[PATCH] Fix PR16360

[Michael Liao]

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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