Use move semantics to push TrajectorySeeds into a vector

[mark-grimes]

Copy of the 7_1_X pull request #3693 for SLHC. From that:

TrajectorySeed has a move constructor (https://github.com/cms-sw/cmssw/blob/CMSSW_6_2_X_SLHC/DataFormats/TrajectorySeed/interface/TrajectorySeed.h#L65) which previously wasn't used for the vector push.

I haven't done any benchmarking, but each individual push_back should be quite small. At 140 pileup however pixelPairStepSeeds has O(100000) of these push_backs, and that's just one of the tracking steps.

[cmsbuild]

A new Pull Request was created by @mark-grimes (Mark Grimes) for CMSSW_6_2_X_SLHC.

Use move semantics to push TrajectorySeeds into a vector

It involves the following packages:

RecoTracker/TkSeedGenerator

@nclopezo, @cmsbuild, @anton-a, @thspeer, @slava77, @Degano can you please review it and eventually sign? Thanks.
@ghellwig, @GiacomoSguazzoni, @rovere, @gpetruc, @cerati, @venturia this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.
@andersonjacob, @mark-grimes you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[mark-grimes]

merge

Compiles fine. Trivial change so I didn't run the full set of tests, and it's been accepted for 7_1_X.