Fix SIGILL crash on ARM64 platforms with SME but no SVE #127398

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AndyAyersMS:fix/122608-sve-sigill

Commits on Apr 24, 2026

Fix SIGILL crash on ARM64 platforms with SME but no SVE (dotnet/runtime#122608)

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Andrew Ayers
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Address review feedback: remove redundant assert, derive vq from sve->vl

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Andrew Ayers
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Address review feedback: clean up dead code and improve assertions

authored and
Andrew Ayers
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