[llvm] Missing AArch64ISD::BICi handling (PR #76644)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon commented:

Ideally we need to separate the ISD::AVG knownbits handling into a followup patch - @davemgreen can you suggest any simpler tests that will create BICi nodes that the target node KnownBits handling could show?

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