Enable containment test for AVX.LoadVector256/LoadAlignedVector256

[fiigii]

After AVX.Load* intrinsics get implemented, the HW-intrinsic test template should enable containment test for AVX.LoadVector256/LoadAlignedVector256.

dotnet/coreclr#16200 (comment)

cc @tannergooding @CarolEidt

[tannergooding]

@fiigii, are you planning on enabling these after dotnet/coreclr#16200 is merged, or should I do it?

[fiigii]

are you planning on enabling these after dotnet/coreclr#16200 is merged,

Yes, I can do it. Do not worry 😄
BTW, I will submit a PR to implement most of the simple SIMD intrinsics of AVX/AVX2 in this week, which probably a good chance to test containment on AVX.LoadVector256/LoadAlignedVector256 as well.

[CarolEidt]

@fiigii - I assigned this to you, as well as one for the simple AVX/AVXs intrinsics (#16426).

[fiigii]

@CarolEidt Got it. Thanks. In the future, if I have any plan, I will open issues at first.