Move CSharp/Test/Emit/Attributes to Emit2

[cston]

Avoid exceeding the combined string length maximum for Emit tests.

[RikkiGibson]

Original declaration for reference

roslyn/src/Compilers/CSharp/Test/Emit/Attributes/WellKnownAttributesTestBase.cs

Lines 86 to 103 in f51c1b2

	internal static void VerifyParamArrayAttribute(ParameterSymbol parameter, bool expected = true)
	{
	Assert.Equal(expected, parameter.IsParams);
	var peParameter = (PEParameterSymbol)parameter;
	var allAttributes = ((PEModuleSymbol)parameter.ContainingModule).GetCustomAttributesForToken(peParameter.Handle);
	var paramArrayAttributes = allAttributes.Where(a => a.AttributeClass.ToTestDisplayString() == "System.ParamArrayAttribute");
	if (expected)
	{
	Assert.Equal(1, paramArrayAttributes.Count());
	}
	else
	{
	Assert.Empty(paramArrayAttributes);
	}
	}
	}

[jcouv]

LGTM Thanks (iteration 1)