Trojan Killer

What's new in this version:

In Depth
- General: Due to limitations in the TLS stack on 10.7 we are updating the minimum macOS development target from 10.7 to 10.9. Mono will be supported only on 10.9 or newer versions starting with this release.

Runtime
- AOT: Few hard to track race conditions in trampolines unboxing for AOT backend targetting amd64 were fixed.
- Interpreter: The interpreter received the first set of low-level optimizations, improving the execution time of typeof call by the factor of 10. Further changes were made to avoid unnecessary allocations and support Xamarin native types (nint/nuint).
- Custom Marshalers: The logic handling custom marshalers, types implementing IICustomMarshaler has been mostly rewritten in managed code with additional caching mechanisms to match .NET Framework behaviour.
- Optimizations: The intrinsics built on top of SSE41 for Math.Round/Math.Floor/Math.Ceiling were added.
- Windows: Mono Windows cross-compiler is using the same LLVM release branch as Linux resolving issues in scenarios where llvm-config.exe can’t be run (none WSL/CygWin build target).

Class Libraries
- CoreFX convergence: In this release, more CoreFX code was imported in particular in System.Reflection namespace. Many common types in mscorlib System namespace are now fully CoreFX based including System.Math. The Registry implementation on Windows is now fully based on CoreFX implementation.
- Mono.Options: A new CommandSet.GetCompletions() method was introduced, which returns all possible commands which match a given completion prefix. This is intended for e.g. bash completion support.
- System.Runtime.InteropServices: It’s now possible to use RuntimeInformation API to detect ARM and ARM64 platforms.

Tools
- MSBuild: Reference assemblies for .NET 4.7.2 are included to allow targeting .NET Framework 4.7.2 using MSBuild on Mono.