Created Unassigned: Performance: InitializeDatabase regressed by changeset f201cf29c15f [1194]

[Changeset f201cf29c15f6cf5c3efe34310d6eefee1744efa](https://entityframework.codeplex.com/SourceControl/changeset/f201cf29c15f6cf5c3efe34310d6eefee1744efa) introduces a performance regression to the database creation process of up to 22% (in very large models) when compared to previous versions of this same code.

The culprit of this performance regression is the new call to DbContextExtension.GetDynamicUpdateModel as part of the DbMigrator ctor.