Spring SPR-16837 - When remove a bean, and then remove this bean's alias

fix a bug : https://jira.spring.io/projects/SPR/issues/SPR-16837?filter=allopenissues

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Comment From: bclozel

Sorry about the late feedback. Thanks for this contribution, but we don't think this can be merged. Bean aliases and bean definitions are two separate concepts. Once can remove a bean definition, leave the aliases in place and add a new definition replacing the former one. The aliases situation can also get more complex with runtime bean definitions or with parent/child context setups.