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Arm64-SVE: Support Vector<T> as element of an array - #133943

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Convert GenTreeIndexAddr::gtElemSize from unsigned to ValueSize to allow reasoning on a runtime evaluated size.

When indexing Vector<T>[], scale the index by Sve.Count8BitElements at runtime before accessing.

Convert GenTreeIndexAddr::gtElemSize from `unsigned` to `ValueSize` to allow
reasoning on a runtime evaluated size.

When indexing `Vector<T>[]`, scale the index by `Sve.Count8BitElements` at runtime
before accessing.
@github-actions github-actions Bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Sep 15, 2026
@dotnet-policy-service dotnet-policy-service Bot added the community-contribution Indicates that the PR has been added by a community member label Sep 15, 2026
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