[llvm] [AArch64] Allow splitting bitmasks for EOR/ORR. (PR #150394)

[via llvm-commits]

AZero13 wrote:

Thank you so much! I have been trying to figure out how to do this for while but then other PRs got caught up. 

out of curiosity, have you read https://devblogs.microsoft.com/oldnewthing/20220808-00/?p=106953

because it also talks about this

https://github.com/llvm/llvm-project/pull/150394