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xAODRootAccess: Work around root 6.20.02 destructor issue.

Merged xAODRootAccess: Work around root 6.20.02 destructor issue.
ssnyder/athena:dtor.xAODRootAccess-20200414 into master
Merged Scott Snyder requested to merge ssnyder/athena:dtor.xAODRootAccess-20200414 into master
  1. Apr 14, 2020
    • scott snyder's avatar
      xAODRootAccess: Work around root 6.20.02 destructor issue. · ea792651
      scott snyder authored 
      ~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.
      ea792651