[mono][interpreter] Make nint and nuint work for interpreter simd intrinsics

[lewing]

PackedSimd is currently broken in the interpreter with nint and nuint types because of this, and Vector128 fails to find the intrinsics. Additionally Vector128<nuint> is used in a potential hot path.

runtime/src/libraries/System.Private.CoreLib/src/System/Text/Unicode/Utf16Utility.Validation.cs

Line 293 in 4b16dce

Vector128<nuint> sumVector = (Vector128<ushort>.Zero - twoOrMoreUtf8Bytes - threeOrMoreUtf8Bytes).AsNUInt();

fixes #114088
Also fixes PackedSimd.Store*, and ConvertToDoubleLower interpreter intrinsics identified by the tests

[dotnet-policy-service]

Tagging subscribers to this area: @BrzVlad, @kotlarmilos
See info in area-owners.md if you want to be subscribed.

[lewing]

More fixes on the way

[Copilot]

Copilot wasn't able to review any files in this pull request.

Files not reviewed (1)

• src/mono/mono/mini/interp/transform-simd.c: Language not supported

[lewing]

Need to add a test case

[lewing]

I will backport the runtime abort fixes to net 9 manually.

#114218

[lewing]

/ba-g failures are unrelated