Ifdef out useless code
Ifdef out useless code

In 64 bit builds Lowering::DecompNodeHelper does nothing so walking the trees is pointless.  Profiling indicates that this accounts for 0.5% of the mscorlib crossgen time.

wkchoy74/coreclr,dasMulli/coreclr,cydhaselton/coreclr,bartonjs/coreclr,martinwoodward/coreclr,andschwa/coreclr,josteink/coreclr,alexperovich/coreclr,krk/coreclr,vinnyrom/coreclr,sperling/coreclr,andschwa/coreclr,jamesqo/coreclr,sjsinju/coreclr,russellhadley/coreclr,benpye/coreclr,cydhaselton/coreclr,James-Ko/coreclr,stormleoxia/coreclr,sjsinju/coreclr,krk/coreclr,sjsinju/coreclr,qiudesong/coreclr,dasMulli/coreclr,cshung/coreclr,bitcrazed/coreclr,ramarag/coreclr,krytarowski/coreclr,sejongoh/coreclr,poizan42/coreclr,poizan42/coreclr,KrzysztofCwalina/coreclr,mocsy/coreclr,mokchhya/coreclr,kyulee1/coreclr,ramarag/coreclr,roncain/coreclr,alexperovich/coreclr,qiudesong/coreclr,manu-silicon/coreclr,Godin/coreclr,bartonjs/coreclr,bartdesmet/coreclr,manu-silicon/coreclr,ruben-ayrapetyan/coreclr,schellap/coreclr,SlavaRa/coreclr,geertdoornbos/coreclr,alexperovich/coreclr,vinnyrom/coreclr,KrzysztofCwalina/coreclr,SlavaRa/coreclr,jamesqo/coreclr,blackdwarf/coreclr,russellhadley/coreclr,poizan42/coreclr,Godin/coreclr,neurospeech/coreclr,cydhaselton/coreclr,dpodder/coreclr,mokchhya/coreclr,poizan42/coreclr,Godin/coreclr,krk/coreclr,ruben-ayrapetyan/coreclr,shahid-pk/coreclr,taylorjonl/coreclr,josteink/coreclr,jhendrixMSFT/coreclr,qiudesong/coreclr,blackdwarf/coreclr,josteink/coreclr,manu-silicon/coreclr,krytarowski/coreclr,KrzysztofCwalina/coreclr,swgillespie/coreclr,KrzysztofCwalina/coreclr,bartdesmet/coreclr,chuck-mitchell/coreclr,yeaicc/coreclr,YongseopKim/coreclr,dpodder/coreclr,ruben-ayrapetyan/coreclr,cydhaselton/coreclr,JosephTremoulet/coreclr,Lucrecious/coreclr,AlexGhiondea/coreclr,vinnyrom/coreclr,sejongoh/coreclr,qiudesong/coreclr,cshung/coreclr,geertdoornbos/coreclr,yizhang82/coreclr,ZhichengZhu/coreclr,kyulee1/coreclr,JosephTremoulet/coreclr,bartdesmet/coreclr,LLITCHEV/coreclr,benpye/coreclr,gkhanna79/coreclr,andschwa/coreclr,cmckinsey/coreclr,sperling/coreclr,swgillespie/coreclr,geertdoornbos/coreclr,wateret/coreclr,roncain/coreclr,shahid-pk/coreclr,Godin/coreclr,AlexGhiondea/coreclr,KrzysztofCwalina/coreclr,parjong/coreclr,gkhanna79/coreclr,sejongoh/coreclr,pgavlin/coreclr,Godin/coreclr,rartemev/coreclr,SlavaRa/coreclr,ragmani/coreclr,swgillespie/coreclr,manu-silicon/coreclr,andschwa/coreclr,James-Ko/coreclr,Dmitry-Me/coreclr,naamunds/coreclr,cydhaselton/coreclr,jhendrixMSFT/coreclr,wkchoy74/coreclr,gkhanna79/coreclr,ragmani/coreclr,benpye/coreclr,schellap/coreclr,ktos/coreclr,Dmitry-Me/coreclr,mskvortsov/coreclr,dasMulli/coreclr,shahid-pk/coreclr,taylorjonl/coreclr,stormleoxia/coreclr,benpye/coreclr,krk/coreclr,LLITCHEV/coreclr,mocsy/coreclr,James-Ko/coreclr,taylorjonl/coreclr,neurospeech/coreclr,ragmani/coreclr,krk/coreclr,naamunds/coreclr,ZhichengZhu/coreclr,mskvortsov/coreclr,hseok-oh/coreclr,sagood/coreclr,martinwoodward/coreclr,parjong/coreclr,mokchhya/coreclr,chuck-mitchell/coreclr,geertdoornbos/coreclr,wkchoy74/coreclr,sejongoh/coreclr,cshung/coreclr,ruben-ayrapetyan/coreclr,josteink/coreclr,sperling/coreclr,yeaicc/coreclr,bartdesmet/coreclr,andschwa/coreclr,swgillespie/coreclr,rartemev/coreclr,geertdoornbos/coreclr,stormleoxia/coreclr,Dmitry-Me/coreclr,ramarag/coreclr,yizhang82/coreclr,vinnyrom/coreclr,hseok-oh/coreclr,blackdwarf/coreclr,krytarowski/coreclr,shahid-pk/coreclr,mocsy/coreclr,wateret/coreclr,wtgodbe/coreclr,botaberg/coreclr,mmitche/coreclr,mocsy/coreclr,tijoytom/coreclr,geertdoornbos/coreclr,sejongoh/coreclr,josteink/coreclr,pgavlin/coreclr,LLITCHEV/coreclr,bitcrazed/coreclr,alexperovich/coreclr,schellap/coreclr,mmitche/coreclr,YongseopKim/coreclr,schellap/coreclr,sperling/coreclr,vinnyrom/coreclr,chuck-mitchell/coreclr,AlexGhiondea/coreclr,Dmitry-Me/coreclr,YongseopKim/coreclr,taylorjonl/coreclr,ragmani/coreclr,jhendrixMSFT/coreclr,Lucrecious/coreclr,ragmani/coreclr,mocsy/coreclr,dasMulli/coreclr,cmckinsey/coreclr,dpodder/coreclr,wateret/coreclr,JosephTremoulet/coreclr,dasMulli/coreclr,sagood/coreclr,tijoytom/coreclr,tijoytom/coreclr,bartonjs/coreclr,sjsinju/coreclr,chuck-mitchell/coreclr,schellap/coreclr,sagood/coreclr,benpye/coreclr,naamunds/coreclr,KrzysztofCwalina/coreclr,wtgodbe/coreclr,botaberg/coreclr,parjong/coreclr,wtgodbe/coreclr,mokchhya/coreclr,ZhichengZhu/coreclr,naamunds/coreclr,tijoytom/coreclr,cmckinsey/coreclr,roncain/coreclr,hseok-oh/coreclr,yeaicc/coreclr,SlavaRa/coreclr,poizan42/coreclr,sagood/coreclr,josteink/coreclr,martinwoodward/coreclr,roncain/coreclr,Lucrecious/coreclr,roncain/coreclr,JonHanna/coreclr,sperling/coreclr,bitcrazed/coreclr,ktos/coreclr,blackdwarf/coreclr,LLITCHEV/coreclr,martinwoodward/coreclr,neurospeech/coreclr,russellhadley/coreclr,Lucrecious/coreclr,mmitche/coreclr,alexperovich/coreclr,mokchhya/coreclr,sjsinju/coreclr,JonHanna/coreclr,naamunds/coreclr,benpye/coreclr,ktos/coreclr,naamunds/coreclr,parjong/coreclr,manu-silicon/coreclr,kyulee1/coreclr,shahid-pk/coreclr,wateret/coreclr,kyulee1/coreclr,ramarag/coreclr,ZhichengZhu/coreclr,hseok-oh/coreclr,sagood/coreclr,russellhadley/coreclr,cydhaselton/coreclr,ruben-ayrapetyan/coreclr,dpodder/corecl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