[IRGen] Reserve witness table private data space for conditional conformance tables.
[IRGen] Reserve witness table private data space for conditional conformance tables.

Pointers to the witness tables of any conditional conformances are placed into
private data, closest to the base pointer, i.e. wtable_ptr[-1] will be the
first (if any) conditional conformance witness table. These always need to be
provided by the context, and copied in when the witness table is instantiated,
making reserving space easy: increment the size of the private data section.

harlanhaskins/swift,jckarter/swift,devincoughlin/swift,brentdax/swift,jckarter/swift,apple/swift,xedin/swift,airspeedswift/swift,rudkx/swift,frootloops/swift,alblue/swift,danielmartin/swift,alblue/swift,harlanhaskins/swift,tkremenek/swift,alblue/swift,CodaFi/swift,JGiola/swift,danielmartin/swift,jckarter/swift,lorentey/swift,austinzheng/swift,JGiola/swift,brentdax/swift,harlanhaskins/swift,gregomni/swift,danielmartin/swift,zisko/swift,huonw/swift,apple/swift,sschiau/swift,jopamer/swift,austinzheng/swift,allevato/swift,shahmishal/swift,gregomni/swift,natecook1000/swift,shajrawi/swift,jckarter/swift,gribozavr/swift,practicalswift/swift,lorentey/swift,ahoppen/swift,sschiau/swift,apple/swift,xwu/swift,practicalswift/swift,austinzheng/swift,lorentey/swift,brentdax/swift,xwu/swift,allevato/swift,allevato/swift,stephentyrone/swift,nathawes/swift,benlangmuir/swift,xwu/swift,shahmishal/swift,airspeedswift/swift,atrick/swift,stephentyrone/swift,glessard/swift,stephentyrone/swift,atrick/swift,natecook1000/swift,apple/swift,xedin/swift,ahoppen/swift,devincoughlin/swift,devincoughlin/swift,huonw/swift,tkremenek/swift,jmgc/swift,aschwaighofer/swift,rudkx/swift,parkera/swift,aschwaighofer/swift,shahmishal/swift,sschiau/swift,xedin/swift,shajrawi/swift,glessard/swift,gribozavr/swift,aschwaighofer/swift,atrick/swift,jmgc/swift,benlangmuir/swift,tkremenek/swift,tkremenek/swift,jckarter/swift,shajrawi/swift,gregomni/swift,practicalswift/swift,rudkx/swift,gregomni/swift,airspeedswift/swift,tjw/swift,harlanhaskins/swift,apple/swift,jopamer/swift,glessard/swift,jopamer/swift,apple/swift,atrick/swift,parkera/swift,zisko/swift,karwa/swift,practicalswift/swift,aschwaighofer/swift,frootloops/swift,benlangmuir/swift,atrick/swift,lorentey/swift,brentdax/swift,roambotics/swift,brentdax/swift,karwa/swift,natecook1000/swift,shahmishal/swift,alblue/swift,jmgc/swift,airspeedswift/swift,karwa/swift,gribozavr/swift,lorentey/swift,stephentyrone/swift,hooman/swift,CodaFi/swift,tkremenek/swift,stephentyrone/swift,hooman/swift,jmgc/swift,CodaFi/swift,nathawes/swift,roambotics/swift,devincoughlin/swift,huonw/swift,amraboelela/swift,CodaFi/swift,tjw/swift,ahoppen/swift,aschwaighofer/swift,rudkx/swift,shajrawi/swift,gribozavr/swift,sschiau/swift,huonw/swift,airspeedswift/swift,lorentey/swift,harlanhaskins/swift,zisko/swift,tkremenek/swift,austinzheng/swift,karwa/swift,allevato/swift,parkera/swift,JGiola/swift,jckarter/swift,roambotics/swift,xedin/swift,benlangmuir/swift,practicalswift/swift,stephentyrone/swift,brentdax/swift,devincoughlin/swift,stephentyrone/swift,ahoppen/swift,jopamer/swift,sschiau/swift,allevato/swift,huonw/swift,airspeedswift/swift,amraboelela/swift,tjw/swift,gribozavr/swift,jopamer/swift,harlanhaskins/swift,amraboelela/swift,JGiola/swift,frootloops/swift,JGiola/swift,glessard/swift,zisko/swift,aschwaighofer/swift,jckarter/swift,austinzheng/swift,CodaFi/swift,xedin/swift,roambotics/swift,practicalswift/swift,gribozavr/swift,parkera/swift,shahmishal/swift,zisko/swift,devincoughlin/swift,practicalswift/swift,jmgc/swift,jopamer/swift,xwu/swift,huonw/swift,benlangmuir/swift,jopamer/swift,tjw/swift,practicalswift/swift,nathawes/swift,sschiau/swift,zisko/swift,roambotics/swift,natecook1000/swift,tkremenek/swift,devincoughlin/swift,tjw/swift,hooman/swift,natecook1000/swift,CodaFi/swift,shajrawi/swift,parkera/swift,shahmishal/swift,karwa/swift,austinzheng/swift,xedin/swift,allevato/swift,sschiau/swift,aschwaighofer/swift,glessard/swift,gregomni/swift,frootloops/swift,lorentey/swift,gregomni/swift,amraboelela/swift,danielmartin/swift,jmgc/swift,nathawes/swift,amraboelela/swift,atrick/swift,devincoughlin/swift,ahoppen/swift,shajrawi/swift,sschiau/swift,karwa/swift,nathawes/swift,amraboelela/swift,alblue/swift,parkera/swift,tjw/swift,xwu/swift,danielmartin/swift,hooman/swift,hooman/swift,benlangmuir/swift,shahmishal/swift,shajrawi/swift,JGiola/swift,hooman/swift,xedin/swift,karwa/swift,frootloops/swift,austinzheng/swift,danielmartin/swift,hooman/swift,danielmartin/swift,CodaFi/swift,karwa/swift,alblue/swift,jmgc/swift,shahmishal/swift,shajrawi/swift,gribozavr/swift,amraboelela/swift,lorentey/swift,frootloops/swift,ahoppen/swift,huonw/swift,glessard/swift,brentdax/swift,harlanhaskins/swift,zisko/swift,roambotics/swift,nathawes/swift,natecook1000/swift,parkera/swift,natecook1000/swift,alblue/swift,xwu/swift,parkera/swift,xedin/swift,rudkx/swift,gribozavr/swift,nathawes/swift,rudkx/swift,allevato/swift,tjw/swift,frootloops/swift,xwu/swift,airspeedswift/swift