Implement TypedReference

[MichalStrehovsky]

Very low priority. Required for ECMA-335 completeness, but not in the .NET Core profile (for now or forever).

[AlexBHarley]

@MichalStrehovsky I'd like to look into this. Is there any chance you can give me a starting point for this?

[MichalStrehovsky]

Thanks for volunteering!

I would defer to @jkotas whether it's worth investing into this right now though.

[jkotas]

This is not needed for .NET Core. It would be only needed if we ever wanted to target full .NET Framework surface using the CoreRT compiler.

[jkotas]

@AlexBHarley I have fixed up the UpForGrabs to make sure they are appropriate. Could you please take a look whether there is anything interesting? I would recommend starting with some items related to CppCodeGen because of it is easier to ramp up on it (e.g. #874 or #910 are good CppCodeGen workitems).

[MichalStrehovsky]

As per dotnet/standard#20 this will be part of the .NET Standard. Exact prioritization TBD, but reopening.

[MichalStrehovsky]

The type was recently added to CoreLib. What we'll need to do:

• Move the type to the proper namespace under #if CORERT ifdef.
• Update the compiler to parse ELEMENT_TYPE_TYPEDBYREF
• Add a new rare flag to EEType (IsByRefLike) and set it for TypedReference
• Block TypedReference from entering places where CoreCLR blocks byref-like types (e.g. Activator.CreateInstance, GetUninitializedObject, Array.CreateInstance etc.)
• Unblock the TypedReference tests in CoreCLR.issues.targets

[MichalStrehovsky]

Eh, I'll just do it now.