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xAODRootAccess: Work around root 6.20.02 destructor issue.

Scott Snyder requested to merge ssnyder/athena:dtor.xAODRootAccess-20200414 into master

~TMethodCall dereferences gCling. But if it is being run as part of global destructors, then gCling may have already been destroyed by the time the TMethodCall destructor runs.

Change TAuxVectorFactory to hold the TMethodCall instance by pointer to guard against this.

Needed to fix test failure in xAODDataSource.

See !31633 (merged).

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