[master] Update dependencies from dotnet/corefx (dotnet/coreclr#23893)

[master] Update dependencies from dotnet/corefx (dotnet/coreclr#23893)

* Update dependencies from https://github.com/dotnet/corefx build 20190411.2

- Microsoft.NETCore.Platforms - 3.0.0-preview5.19211.2
- Microsoft.Private.CoreFx.NETCoreApp - 4.6.0-preview5.19211.2

* Update dependencies from https://github.com/dotnet/corefx build 20190411.22

- Microsoft.NETCore.Platforms - 3.0.0-preview5.19211.22
- Microsoft.Private.CoreFx.NETCoreApp - 4.6.0-preview5.19211.22

* Removing renamed HWIntrinsic APIs from S.P.Corelib

* Updating the hwintrinsiclistxarch to match the new intrinsic API names

* Updating the HWIntrinsic generated tests to use the new API names

Commit migrated from https://github.com/dotnet/coreclr/commit/ecbf6bf4300e770ba786395554cf032a57c50beb