AVX-512 debugger support: view registers

[BruceForstall]

AVX-512 introduces new zmm and k registers. The Visual Studio Registers window can show these if you right-click in the window and choose "AVX-512". However, the values are "grayed out" when debugging a managed app, and they do not show actual values (they show zeros).

The Registers window also shows ymm registers if you right-click and choose "AVX". These are also not available when debugging a managed app.

It appears that Vector512 variables do show the correct values.

To add support for the Registers window:

1. Ensure the AVX/AVX-512 registers are defined in the CorDebugRegister enum
2. Review ICorDebugRegisterSet2 to ensure the API would work with AVX/AVX-512
3. Add the appropriate implementation to CordbRegisterSet::GetRegistersAvailable, CordbRegisterSet::GetRegisters, more.

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

Issue Details

---

AVX-512 introduces new zmm and k registers. The Visual Studio Registers window can show these if you right-click in the window and choose "AVX-512". However, the values are "grayed out" when debugging a managed app, and they do not show actual values (they show zeros).

The Registers window also shows ymm registers if you right-click and choose "AVX". These are also not available when debugging a managed app.

It appears that Vector512 variables do show the correct values.

Author:	BruceForstall
Assignees:	-
Labels:	area-Diagnostics-coreclr, arch-avx512
Milestone:	Future

[tommcdon]

cc @caslan

[BruceForstall]

cc @dotnet/avx512-contrib