[llvm] [AArch64] Add command-line flag to disable MOPS for memory intrinsics (PR #172722)

[Ties Stuij via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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stuij wrote:

Yea, I was a bit worried that the intent of the tests might get lost, but you do get more coverage this way and less duplication, so I've merged them into `aarch64-mops.ll` now.

https://github.com/llvm/llvm-project/pull/172722