Make statics thread local in TrackingTools/TrajectoryCleaning

[wmtan]

For thread safety, two non-const static variables are made thread local. These variables used to be on the stack, but were made static as a performance optimization.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_0_X.

Make statics thread local in TrackingTools/TrajectoryCleaning

It involves the following packages:

TrackingTools/TrajectoryCleaning

@nclopezo, @cmsbuild, @thspeer, @slava77 can you please review it and eventually sign? Thanks.
@gpetruc, @cerati, @GiacomoSguazzoni, @rovere 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.
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@ktf you are the release manager for this.

[cmsbuild]

+1
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/1250/summary.html

[thspeer]

+1
Tested 8ebe041 in CMSSW_7_0_X_2013-11-08-0200-1372
No difference in reco, based on RelMon and reco scripts.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IBs unless changes or unless it breaks tests. @ktf can you please take care of it?