[llvm] [AArch64] Allow splitting bitmasks for ANDS, EOR and ORR. (PR #149095)

[Ricardo Jesus via llvm-commits]

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rj-jesus wrote:

Apologies, I've just realised my approach was too simplistic and I'll need to update splitBitmaskImm too.

https://github.com/llvm/llvm-project/pull/149095