Producer fields don't work on EJBs

A symptom of this is that a producer field on session bean throws an IllegalArgumentException. See the following two tests in org.jboss.jsr299.tck.tests.implementation.producer.field.definition.enterprise.EnterpriseProducerFieldDefinitionTest to reproduce:

testNonStaticProducerFieldNotInherited()
testNonStaticProducerFieldNotIndirectlyInherited()

and

org.jboss.jsr299.tck.tests.implementation.enterprise.newBean.NewEnterpriseBeanICTest.testNewBeanHasNoProducerFields()