Simon Pilgrim 4baf29e81e [DAG] Handle cases where a shift amount is larger than the pre-extended value bitwidth ...

In the (zext (shl (zext x), cst)) -> (shl (zext x), cst) fold, don't use a bitmask / MaskedValueIsZero as we can't guarantee that the shift amount is in bounds.

Fixes #106202

2024-08-27 18:12:24 +01:00

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