[Arm64] Script SIMD HW intrinsic test like #15771

[sdmaclea]

There is a lot of similarity between X86 and ARM64 Simd tests.
They should be able to use same/similar test generation scripting approaches.

X86 added a test generation script in dotnet/coreclr#15771.

Refactor test/templates to allow use on both platforms.

Arm64 has some different issues

• CoreCLR is ahead of API review & CoreFX. Test will need to be disabled #if.
• Vector64 is the same length as double, ulong, & long. Therefore Vector64 generics only support 7 primitive types.

category:correctness
theme:intrinsics
skill-level:intermediate
cost:medium

[sdmaclea]

@tannergooding Can you do this? Or do you want/need me to do it?

[tannergooding]

I can take a look at making it work for both after the initial ARM tests are merged.

[CarolEidt]

@tannergooding @echesakovMSFT - I believe this has been completed. Feel free to open a new issue if there's remaining test templating work to be done.