Changed function static to be const in ExpressionVar

[Dr15Jones]

The static analyzer complained that a function local static in ExpressionVar was not safe. Converting the variable to const stopped the complaint.

[cmsbuild]

A new Pull Request was created by @Dr15Jones (Chris Jones) for CMSSW_7_5_X.

Changed function static to be const in ExpressionVar

It involves the following packages:

CommonTools/Utils

@nclopezo, @cvuosalo, @monttj, @cmsbuild, @slava77, @vadler can you please review it and eventually sign? Thanks.
@makortel this is something you requested to watch as well.
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[Dr15Jones]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: c2c50ff
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-9063/7530/summary.html

[cvuosalo]

+1

For #9063 c2c50ff

Tiny code fix to support multi-threading. It should not affect any monitored quantities.

The code change is satisfactory, and Jenkins tests against baseline CMSSW_7_5_X_2015-05-12-2300 show no significant differences, as expected.

[davidlange6]

+1