Jira for the numerous performance improvements made by Stuart in https://github.com/hibernate/hibernate-orm/pull/1139
* Don't allocate IdentityMap if it is not needed * Only allocate unresolved insertions if requied * Don't create a new string when creating a named query * Allocate querySpaces lazily * Remove executableLists from ActionQueue * Allocate ExecutableList instances lazily * Lazily allocate the transaction commit task lists * Don't allocate a new EntityKey
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