[llvm] [LAA] Move scalable vector check into `getStrideFromAddRec()` (PR #154013)

[Florian Hahn via llvm-commits]

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+; RUN: opt -mtriple=aarch64-none-elf -mattr=+sve2 -O2 -disable-output
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fhahn wrote:

Could you make this a target-indepent test that just uses `print<access-info>` and check that output?

Probably would also be good to move the test to `llvm/test/Analysis/LoopAccessAnalysis/scalable-vector-regression-tests.ll`, which already contains similar tests

https://github.com/llvm/llvm-project/pull/154013