Linker doesn't emit IL2026 (Warn on calls to a method with RUC) for constructors

[jtschuster]

The linker doesn't warn when a method annotated with RUC is called within a constructor. Tests for this issue are dependent on a fix for issue #2446 (ExpectedWarnings not recognized on constructors).

Example:

class WarningsInCtor
{
	[RequiresUnreferencedCode ("Message for WarningsInCtor.MethodWithRUC")]
	static void MethodWithRUC () { }

	//Bug: Should be produced by trimmer as well
	[ExpectedWarning ("IL2026", "Message for WarningsInCtor.MethodWithRUC", ProducedBy = ProducedBy.Analyzer)]
	public WarningsInCtor () { MethodWithRUC (); }

	//Bug: Should be produced by trimmer as well
	[ExpectedWarning ("IL2026", "Message for WarningsInCtor.MethodWithRUC", ProducedBy = ProducedBy.Analyzer)]
	static WarningsInCtor () { MethodWithRUC (); }
}

[jtschuster]

My mistake, I forgot to reference the class somewhere and it got trimmed.