MiniAOD reprocessing (74X, Gen): Sorted mother and daughter RefVectors in the GenParticlePruner

[ferencek]

Backport of #9709 and #10028

This PR is part of preparations for possible MiniAOD reprocessing of the Spring15 MC and 50ns Run2012B Data in 74X. More info at the following links:

• https://hypernews.cern.ch/HyperNews/CMS/get/physics-validation/2445.html
• https://twiki.cern.ch/twiki/bin/view/CMS/MiniAODSpring15pass2#Gen

[cmsbuild]

A new Pull Request was created by @ferencek (Dinko Ferencek) for CMSSW_7_4_X.

MiniAOD reprocessing (74X, Gen): Sorted mother and daughter RefVectors in the GenParticlePruner

It involves the following packages:

PhysicsTools/HepMCCandAlgos

@cmsbuild, @vadler, @monttj can you please review it and eventually sign? Thanks.
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@Degano you are the release manager for this.
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[ferencek]

@monttj, can you please start the tests

[monttj]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: b0ae877
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10366/6907/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10366/6907/summary.html

[monttj]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_X IBs once checked with relvals in the development release cycle of CMSSW (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar

[davidlange6]

closing PRs included in #10649