runtime: avoid memory allocations in checkTransitiveCompleteness
runtime: avoid memory allocations in checkTransitiveCompleteness

Use SmallVector instead of std::vector and a SmallPtrSet-like implementation for the set.

shahmishal/swift,xwu/swift,parkera/swift,devincoughlin/swift,nathawes/swift,CodaFi/swift,parkera/swift,benlangmuir/swift,stephentyrone/swift,jmgc/swift,xedin/swift,benlangmuir/swift,rudkx/swift,rudkx/swift,devincoughlin/swift,ahoppen/swift,shajrawi/swift,gribozavr/swift,allevato/swift,parkera/swift,aschwaighofer/swift,benlangmuir/swift,shahmishal/swift,jckarter/swift,xwu/swift,hooman/swift,airspeedswift/swift,parkera/swift,hooman/swift,harlanhaskins/swift,gribozavr/swift,glessard/swift,xwu/swift,JGiola/swift,xedin/swift,benlangmuir/swift,nathawes/swift,atrick/swift,CodaFi/swift,ahoppen/swift,gribozavr/swift,airspeedswift/swift,shahmishal/swift,xwu/swift,glessard/swift,jmgc/swift,sschiau/swift,sschiau/swift,devincoughlin/swift,hooman/swift,tkremenek/swift,airspeedswift/swift,hooman/swift,glessard/swift,karwa/swift,nathawes/swift,atrick/swift,sschiau/swift,roambotics/swift,parkera/swift,shajrawi/swift,karwa/swift,rudkx/swift,aschwaighofer/swift,apple/swift,parkera/swift,JGiola/swift,harlanhaskins/swift,airspeedswift/swift,shajrawi/swift,allevato/swift,parkera/swift,roambotics/swift,aschwaighofer/swift,tkremenek/swift,karwa/swift,xwu/swift,tkremenek/swift,jckarter/swift,glessard/swift,sschiau/swift,gregomni/swift,devincoughlin/swift,shajrawi/swift,shajrawi/swift,aschwaighofer/swift,atrick/swift,lorentey/swift,apple/swift,gribozavr/swift,aschwaighofer/swift,sschiau/swift,roambotics/swift,lorentey/swift,JGiola/swift,jckarter/swift,gribozavr/swift,stephentyrone/swift,sschiau/swift,parkera/swift,apple/swift,roambotics/swift,xedin/swift,CodaFi/swift,tkremenek/swift,devincoughlin/swift,harlanhaskins/swift,shahmishal/swift,CodaFi/swift,stephentyrone/swift,jmgc/swift,xedin/swift,lorentey/swift,lorentey/swift,roambotics/swift,CodaFi/swift,tkremenek/swift,tkremenek/swift,gregomni/swift,stephentyrone/swift,tkremenek/swift,jmgc/swift,allevato/swift,jmgc/swift,hooman/swift,shajrawi/swift,shahmishal/swift,airspeedswift/swift,ahoppen/swift,karwa/swift,karwa/swift,shahmishal/swift,sschiau/swift,nathawes/swift,devincoughlin/swift,lorentey/swift,JGiola/swift,devincoughlin/swift,nathawes/swift,jckarter/swift,lorentey/swift,stephentyrone/swift,CodaFi/swift,gribozavr/swift,JGiola/swift,harlanhaskins/swift,apple/swift,sschiau/swift,apple/swift,gregomni/swift,aschwaighofer/swift,gregomni/swift,xwu/swift,JGiola/swift,rudkx/swift,gribozavr/swift,atrick/swift,karwa/swift,xedin/swift,shahmishal/swift,xwu/swift,gribozavr/swift,gregomni/swift,airspeedswift/swift,harlanhaskins/swift,shahmishal/swift,karwa/swift,apple/swift,lorentey/swift,benlangmuir/swift,stephentyrone/swift,karwa/swift,jckarter/swift,shajrawi/swift,jmgc/swift,aschwaighofer/swift,harlanhaskins/swift,roambotics/swift,jckarter/swift,hooman/swift,glessard/swift,hooman/swift,atrick/swift,allevato/swift,ahoppen/swift,benlangmuir/swift,ahoppen/swift,shajrawi/swift,CodaFi/swift,stephentyrone/swift,gregomni/swift,ahoppen/swift,lorentey/swift,airspeedswift/swift,xedin/swift,nathawes/swift,jmgc/swift,allevato/swift,xedin/swift,rudkx/swift,nathawes/swift,harlanhaskins/swift,allevato/swift,devincoughlin/swift,atrick/swift,glessard/swift,xedin/swift,rudkx/swift,jckarter/swift,allevato/swift