llvm-project

53ec484e - [SelectionDAG] Add CTLS to FoldConstantArithmetic and optimize i1 CTLS to 0. (#178552)

[SelectionDAG] Add CTLS to FoldConstantArithmetic and optimize i1 CTLS to 0. (#178552) Since we don't have a CTLS intrinsic, it likely gets constant folded while it is still a CTLZ pattern so I'm using a unittest to test it.