[mono] Allow overriding CustomAttributeData accessors #55728
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routines to allow them being overridden (like with CoreCLR).
Even after #55726,
System.Text.Json.SourceGeneration.Testsare still failing when using a Mono-based dotnet runtime. This new problem is triggered because the source-generation logic provides a classCustomAttributeDataWrapperderived fromCustomAttributeData, which overrides the latter class' accessor routinesConstructor,ConstructorArguments, andNamedArguments.This works with CoreCLR. However, with the current Mono implementation, other routines in
CustomAttributeDatanow crash when called on an instance of the derived class, because they now access internal data members that have never been initialized. Fix this by instead calling the accessor routines like in CoreCLR.