remove CTPPSPixelGainCalibration copying in RPixDetClusterizer

[slava77]

https://github.com/cms-sw/cmssw/blob/CMSSW_9_4_0_pre1/RecoCTPPS/PixelLocal/src/RPixDetClusterizer.cc#L130
leads to extremely large CPU use
https://slava77sk.web.cern.ch/slava77sk/reco/cgi-bin/igprof-navigator/CMSSW_9_4_X_2017-09-24-0000-sign962.294736.reCTPPS.pp/57

the fix seems rather trivial
@fabferro

[cmsbuild]

A new Issue was created by @slava77 Slava Krutelyov.

@davidlange6, @Dr15Jones, @smuzaffar can you please review it and eventually sign/assign? Thanks.

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[slava77]

assign reconstruction

[cmsbuild]

New categories assigned: reconstruction

@slava77,@perrotta you have been requested to review this Pull request/Issue and eventually sign? Thanks

[slava77]

+1

resolved in #20642 , available from CMSSW_9_4_0_pre3

[cmsbuild]

This issue is fully signed and ready to be closed.