[llvm] [AArch64][SME] Allow memory operations lowering to custom SME functions. (PR #79263)

[Sander de Smalen via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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sdesmalen-arm wrote:

Please rename this file, because `mops` has an overloaded meaning. What about `streaming-compatible-memory-ops.ll` ?

https://github.com/llvm/llvm-project/pull/79263