added compiler benchmark to ../INSTALL
added compiler benchmark to ../INSTALL

ZahidDev/primesieve,kimwalisch/primesieve,kimwalisch/primesieve,tempbottle/primesieve,ZahidDev/primesieve,tempbottle/primesieve,fredwang00/primesieve,anatoliyrazin/primesieve,tempbottle/primesieve,fredwang00/primesieve,kimwalisch/primesieve,fredwang00/primesieve,anatoliyrazin/primesieve,ZahidDev/primesieve,anatoliyrazin/primesieve