Replacing PR#5954: Threadsafe faster hcal25ns reco method2

 A new PR. This is the SAME as the latest update of the PR#5954 and meant to replace that (with a fresh pull request...)

(ref: PR#5954: https://github.com/cms-sw/cmssw/pull/5954)
This should stay. I had to remove it due to merging issue for this PR... Do you need me update this PR to include the line? Or can you merge the change from Salavat together with this one?