[llvm] [LSR] Recognize vscale-relative immediates (PR #88124)

[Sam Tebbs via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
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SamTebbs33 wrote:

It would be good to see what your changes do to this test, if you wouldn't mind creating a commit with this test before the commit with your functional changes?

https://github.com/llvm/llvm-project/pull/88124