Add ATLAS_CHECK_THREAD_SAFETY to TrkParametersIdentificationHelpers,TrkRIO_OnTrack,TrkTrackLink

Christos Anastopoulosrequested to merge
ATLAS-EGamma/athena:TrkEvent_ATLAS_CHECK_THREAD_SAFETY_4 into master

This deals mainly with a few static --> const static or atomic (for debug counters)

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