[mono][metadata] Add a method custom attribute scanning function #19880
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!! This PR is a copy of dotnet/runtime#37172, please do not edit or review it in this repo !!
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!! Merge the PR only after the original PR is merged !!
Our normal custom attribute lookup method may trigger loading. This is undesirable during class initialization, for example. For this reason, we have
mono_class_metadata_foreach_custom_attr
that scans a class for custom attributes without triggering loading.This PR adds
mono_method_metadata_foreach_custom_attr
that does the same thing - looks for custom attributes on methods without causing any loader activity.This PR also reorganizes the code in
class-init.c
that uses these metadata custom attribute lookups to be a bit easier to use.Finally we add a convenience method (unused so far) to look for
PreserveBaseOverridesAttribute
which is defined in dotnet/runtime#35315 and which will be necessary to implement covariant returns.