Need a dedicated platform exception type for non-exhaustive switch expression

[gafter]

When a switch expression doesn't have a matching arm at runtime, we need an exception to throw.

[gafter]

Something like

namespace System
{
    /// <summary>
    /// Indicates that a switch expression that was non-exhaustive failed to match its input.
    /// </summary>
    [System.Runtime.InteropServices.ComVisible(true)]
    [Serializable]
    public class MatchFailureException : System.ArgumentException
    {
        public MatchFailureException() { }
    }
}

[jcouv]

@gafter Please open a corefx issue for design review (something like https://github.com/dotnet/corefx/issues/21809).

[gafter]

The corefx issue for this is https://github.com/dotnet/corefx/issues/33284