Make FSharp.Core.Operators.raise inline

[miegir]

If raise will be inlined, tools such as unit test coverage analyzer in Visual Studio will not mark raise calls as partially covered. Methods that use it, such as nullArg, will also benefit from this. Is there a reason whiy raise is not inlined? I can redefine these operators myself, but it requires inline assembly and therefore that annoying red squiggles in Visual Studio.

[saul]

@dsyme this can be closed now that the PR is merged

[zpodlovics]

This is a subissue comment related to #3476

Perhaps I am a bit late for the party, but could you please reconsider the exception inlining in the light of the following performance issues (or consider to do compiler generated thow only non-inlining methods when raise/nullarg/failwith/etc are used):

Do not inline methods that never return: dotnet/coreclr#6103
RyuJIT should not inline throw only methods: https://github.com/dotnet/coreclr/issues/1270

Take a look at what Kestrel (.NET Core HTTP Server) done:
aspnet/KestrelHttpServer@6b161f5