Explode generic Intel hardware intrinsic on all the supported types

[fiigii]

close https://github.com/dotnet/coreclr/issues/20057

This PR removes all the generic Intel hardware intrinsic and explodes them on all the supported types. The generic helpers (e.g., GetLowerHalf<T>) are not handled in this PR, we will move them into Vector128/256<T> classes.

[jkotas]

There is a bunch of new warnings like shared\System\Runtime\Intrinsics\X86\Avx2.cs(742,40): warning CS0108: 'Avx2.ExtractVector128(Vector256<sbyte>, byte)' hides inherited member 'Avx.ExtractVector128(Vector256<sbyte>, byte)'. Use the new keyword if hiding was intended. [D:\j\workspace\x64_checked_w---43686a05\src\System.Private.CoreLib\System.Private.CoreLib.csproj]. Could you please fix those?

[fiigii]

@jkotas Thank you so much! Will fix it tomorrow.

[fiigii]

@CarolEidt @tannergooding @eerhardt

[fiigii]

@dotnet-bot test Windows_NT x64 Checked CoreFX Tests
@dotnet-bot test Ubuntu arm Cross Checked Innerloop Build and Test

[CarolEidt]

@fiigii - you removed a bunch of related tests. Will they be replaced once this flows through corefx?

[fiigii]

Yes, I will rewrite/re-enable them later.

[CarolEidt]

@fiigii - Great, thanks!