ClangImporter: Update Swift for changes in clang (PCH + Modules issues)
ClangImporter: Update Swift for changes in clang (PCH + Modules issues)

This sets the NeededByPCHOrCompilationUsesPCH language option when
emitting a brigding PCH.

rdar://problem/35056912
rdar://problem/30384801

Initial patch by Adrian Prantl

(cherry picked from commit 5d5f542fe47668f80a4661ccccdb0048c9629a39)

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