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xAODRootAccess: Don't crash opening a schema-evolved file.

Scott Snyder requested to merge ssnyder/athena:evol.xAODRootAccess-20201119 into master

Don't crash opening a file that uses some kinds of automatic schema evolution. If the type of a member changes from one class to another (for example, from std::vector to std::vector), then GetExpectedType will give us the on-disk class. To get the class we use in memory, we need to use GetCurrentClass.

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