Allow ParseAbstractFunctionBodyRequest to delay function bodies.
Allow ParseAbstractFunctionBodyRequest to delay function bodies.

Nested function bodies can be delayed, then parsed when they are
needed.

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