[llvm] [AArch64] SimplifyDemandedBitsForTargetNode - add AArch64ISD::BICi handling (PR #76644)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon requested changes to this pull request.

Please consult FoldValue in SelectionDAG.cpp which has the full evaluation for each of the AVG nodes

https://github.com/llvm/llvm-project/pull/76644