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MCTruthClassifier: HepMC3 speedups.

Scott Snyder requested to merge ssnyder/athena:barcode.MCTruthClassifier-20220908 into master

Speed up particleTruthClassifier(ConstgenParticlePtr) by avoiding fetching the barcode of each particle. Introduce particleTruthClassifier(const HepMcParticleLink&), which can take advantage of xAODTruthParticleLinkVector::find().

See ATLASRECTS-7054.

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