[llvm] [AArch64] Decompose constant multiplies used only by memory addresses (PR #194584)

[Jiang Ning via llvm-commits]

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+; NOTE: Assertions have been manually written to cover llvm.org/PR161446.
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JiangNingHX wrote:

Done, regenerated the checks with update_llc_test_checks.py and verified the new test passes locally. Thanks!

https://github.com/llvm/llvm-project/pull/194584