[SIL Optimizer] Switch partial specialization to a request.
[SIL Optimizer] Switch partial specialization to a request.

Partial specialization had its own form of generic signature builder
use, which maps well to the new abstract generic signature
request. Use it.

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