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[DAG] getNode() - begin generalizing the (zext (trunc (assertzext x))…
…) -> (assertzext x) fold. We'll need to generalize this fold to check for any zero upperbits to address some of the D155472 regressions, but this exposes a number of issues. For now, just use the general MaskedValueIsZero test instead of the assertzext.
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