* [generator] Use '[U]IntPtr' in the P/Invoke signature for native enums.
* Use '[U]IntPtr' as the parameter type in the P/Invoke signature for native enum
parameters.
* Use '[U]IntPtr' in the P/Invoke method name for native enum parameters.
* Add an explicit conversion from UIntPtr to nuint (like we already have from IntPtr
to nint).
This makes the code identical between .NET and legacy Xamarin when using C# n[u]ints,
because those are really [U]IntPtrs.
* Use IntPtr/UIntPtr for all nint/nuint types in P/Invokes, not only native enums.
* Add a few more casts
Fixes these generator tests:
* GeneratorTests.BGenTests.FieldEnumTests
* GeneratorTests.BGenTests.NativeEnum
* [registrar] Handle UIntPtr like we do IntPtr.
Fixes this error in numerous tests:
error MT4169: Failed to generate a P/Invoke wrapper for objc_msgSend(System.IntPtr,System.IntPtr): The registrar cannot build a signature for type `System.Void' in method `ObjCRuntime.Messaging.objc_msgSend`.
* [NativeTypes] Make IntPtr and UIntPtr behave the same.
This fixes an issue where the linked output for a 32-bit mscorlib.dll and a
64-bit mscorlib.dll would be different, because different explicit operators
for UIntPtr would be kept.
The fix works because the conversion operators for nuint will not use
UIntPtr's explicit conversion operators anymore, it will just operate on plain
memory instead.
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