speed up conversions

ConversionProducer speeds up by 27% on run2012C jetHT.

very small regression.
This was discussed in a reco meeting in April and detailed in
https://twiki.cern.ch/twiki/bin/viewauth/CMS/HighGranularityCMSSWOptimization.



On 1 Jul, 2014, at 11:09 AM, StoyanStoynev <notifications@github.com> wrote:

> In RecoEgamma/EgammaPhotonAlgos/BuildFile.xml:
> 
> > @@ -1,3 +1,5 @@
> > +<flags   CXXFLAGS="-Ofast -mrecip"/>
> 
> Isn't this option (Ofast) too aggressive to use?
“too” with respect to what?
> As I understand even debugging becomes problematic with it.
No. debugging is the same as O2 at the best of my knowedge.
> This would be the first introduction of it in CMSSW, am I right?
No. we did many test in the past including a full set of “experimental” releases

v.