llvm-project

900778e4 - [DAG] isKnownToBeAPowerOfTwo - add DemandedElts + OrZero handling to ISD::SELECT/VSELECT cases (#181753)

[DAG] isKnownToBeAPowerOfTwo - add DemandedElts + OrZero handling to ISD::SELECT/VSELECT cases (#181753) Pass DemandedElts and OrZero arguments through SELECT/VSELECT nodes when checking if values are power-of-two. Add unit tests for scalar SELECT (OrZero) and vector VSELECT (DemandedElts + OrZero). Resolves #181645