Mono 4.2.2 - Versions of .NET

Mono 4.2.2 is a service release for the Mono 4.2 series.

This is a maintenance release and includes fixes for multiple issues found in 4.2.1

C# Compiler

#33341 - Set null operator barrier between invocation instance and its arguments

#35857 - [System.Data] Implement CommandBehavior.SequentialAccess support for GetValues method
#28693 - [System] Remove arbitrary debugging limit from FileSystemWatcher on OSX
#36003 - [corlib] Invalid DateTime format for Finnish and DateTime parser not supporting same separator for date and time (edit)
#37171 - [System.Runtime.Serialization] XmlObjectSerializer: fix ISerializable
[System.Runtime.Serialization] Static serializer calls directly into internal APIs to fix 4.2.1
[corlib] Fix multicast delegate remove behavior
[corlib] Fix multicast Method property
[System.XML] Fix endless recursion in XmlCompiledTransform on mobile

#35828 - [runtime] Fix Thread.CurrentThread in non-root appdomains by setting the tls slot in start_wrapper, otherwise Thread.CurrentThread would create a new Thread object so there would be two
#20186 - [runtime] Make sure ptr-to-structure and structure-and-ptr wrappers are unique, this is needed by full aot
#36292 - [jit] Avoid a verification error in gsharedvt code with ldarga + gshared types
#36256 - [aot] Cache inflated methods loaded from aot images to avoid repeating an expensive search
#35545 - [runtime] Implement native-to-managed marshalling of byref delegate arguments
#36383 - [gsharedvt] Fix support for constrained calls on interfaces.
#36566 - [jit] Increase the buffer size used by the dyncall data structures to 512.
[threadpool] Fix get min and available threads icalls.
[verifier] Fix the verifiers to handle Roslyn style fixed blocks.

Multiple fixes for rare crashes in sgen.

Avoid a crash at shutdown by installing the assembly unload hook for the 'start_unload' event instead of the 'end_un