Sema: Don't validate class layout when validating an extension
Sema: Don't validate class layout when validating an extension

We only need to validate all the members of a class when
we type check an extension, which means we will generate
code for it.

Merely validating an extension, as happens during name
lookup, does not need to validate all members of a class.

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