[jnimarshalmethod-gen] Fix registration on Windows (#721)

`jnimarshalmethod-gen` didn't call [`MethodBuilder.SetParameters()`][0]
when creating the marshal method. While this worked under Mono, the
lack of a `MethodBuilder.SetParameters()` invocation caused
`jnimarshalmethod-gen` to crash when running under .NET Framework:
error JM4006: jnimarshalmethod-gen: Unable to process assembly '.\bin\TestDebug\Java.Interop.Export-Tests.dll'
Specified argument was out of the range of valid values.
Parameter name: The specified parameter index is not in range.
System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: The specified parameter index is not in range.
at System.Reflection.Emit.MethodBuilder.DefineParameter(Int32 position, ParameterAttributes attributes, String strParamName)
at System.Linq.Expressions.Compiler.LambdaCompiler..ctor(AnalyzedTree tree, LambdaExpression lambda, MethodBuilder method)
at System.Linq.Expressions.Compiler.LambdaCompiler.Compile(LambdaExpression lambda, MethodBuilder method, DebugInfoGenerator debugInfoGenerator)
at Xamarin.Android.Tools.JniMarshalMethodGenerator.App.AddRegisterNativeMembers(TypeBuilder dt, ParameterExpression targetType, List`1 registrationElements) in C:\Users\rodo\git\java.interop\tools\jnimarshalmethod-gen\App.cs:line 564
at Xamarin.Android.Tools.JniMarshalMethodGenerator.App.CreateMarshalMethodAssembly(String path) in C:\Users\rodo\git\java.interop\tools\jnimarshalmethod-gen\App.cs:line 426
at Xamarin.Android.Tools.JniMarshalMethodGenerator.App.ProcessAssemblies(List`1 assemblies) in C:\Users\rodo\git\java.interop\tools\jnimarshalmethod-gen\App.cs:line 201
Add a call to `MethodBuilder.SetParameters()` for Windows support.
Additionally, when `jnimarshalmethod-gen -v` (verbose) is used,
print out the type(s) for which`__RegisterNativeMembers()` is being
emitted.
[0]: https://docs.microsoft.com/en-us/dotnet/api/system.reflection.emit.methodbuilder.setparameters?view=netcore-3.1

Author: radekdoulik

tools/jnimarshalmethod-gen/App.cs

@@ -484,8 +484,12 @@ static Expression CreateRegistration (string method, string signature, LambdaExp
 
 staticvoidAddRegisterNativeMembers(TypeBuilderdt,ParameterExpressiontargetType,List<Expression>registrationElements)
 {
-varargs=Expression.Parameter(typeof(JniNativeMethodRegistrationArguments),"args");
+if(Verbose){
+Console.Write("Adding registration method for ");
+ColorWriteLine($"{dt.FullName}",ConsoleColor.Green);
+}
 
+varargs=Expression.Parameter(typeof(JniNativeMethodRegistrationArguments),"args");
 varbody=Expression.Block(
 new[]{targetType},
 Expression.Assign(targetType,Expression.Call(Type_GetType,Expression.Constant(dt.FullName))),
@@ -495,6 +499,7 @@ static void AddRegisterNativeMembers (TypeBuilder dt, ParameterExpression target
 
 varrb=dt.DefineMethod("__RegisterNativeMembers",
 System.Reflection.MethodAttributes.Public|System.Reflection.MethodAttributes.Static);
+rb.SetParameters(typeof(JniNativeMethodRegistrationArguments));
 rb.SetCustomAttribute(newCustomAttributeBuilder(typeof(JniAddNativeMethodRegistrationAttribute).GetConstructor(Type.EmptyTypes),newobject[0]));
 #if _DUMP_REGISTER_NATIVE_MEMBERS
 Console.WriteLine($"## Dumping contents of `{dt.FullName}::__RegisterNativeMembers`: ");