Revert "[ClangImporter] Update for Clang API change in r209002."
Revert "[ClangImporter] Update for Clang API change in r209002."

We still have an outstanding incompatibility with LLVM trunk, so let's
just get in a state where we can build against known commits for now.

This reverts r18233.

Swift SVN r18234

amraboelela/swift,jmgc/swift,tinysun212/swift-windows,shahmishal/swift,atrick/swift,jckarter/swift,airspeedswift/swift,dduan/swift,jtbandes/swift,shajrawi/swift,KrishMunot/swift,apple/swift,jopamer/swift,djwbrown/swift,ahoppen/swift,deyton/swift,mightydeveloper/swift,ben-ng/swift,aschwaighofer/swift,huonw/swift,IngmarStein/swift,sschiau/swift,brentdax/swift,apple/swift,milseman/swift,kentya6/swift,glessard/swift,djwbrown/swift,SwiftAndroid/swift,cbrentharris/swift,jckarter/swift,gmilos/swift,gottesmm/swift,aschwaighofer/swift,Jnosh/swift,hooman/swift,emilstahl/swift,LeoShimonaka/swift,therealbnut/swift,nathawes/swift,Jnosh/swift,milseman/swift,ben-ng/swift,sschiau/swift,tinysun212/swift-windows,xedin/swift,gottesmm/swift,lorentey/swift,khizkhiz/swift,practicalswift/swift,huonw/swift,devincoughlin/swift,CodaFi/swift,alblue/swift,gmilos/swift,jtbandes/swift,Ivacker/swift,harlanhaskins/swift,rudkx/swift,adrfer/swift,hughbe/swift,gmilos/swift,mightydeveloper/swift,gmilos/swift,ken0nek/swift,modocache/swift,shajrawi/swift,cbrentharris/swift,hughbe/swift,sdulal/swift,tkremenek/swift,austinzheng/swift,Ivacker/swift,karwa/swift,MukeshKumarS/Swift,gregomni/swift,rudkx/swift,airspeedswift/swift,arvedviehweger/swift,deyton/swift,aschwaighofer/swift,cbrentharris/swift,manavgabhawala/swift,zisko/swift,manavgabhawala/swift,danielmartin/swift,zisko/swift,swiftix/swift,cbrentharris/swift,manavgabhawala/swift,tjw/swift,IngmarStein/swift,johnno1962d/swift,return/swift,frootloops/swift,tardieu/swift,russbishop/swift,nathawes/swift,Jnosh/swift,SwiftAndroid/swift,codestergit/swift,kentya6/swift,dreamsxin/swift,return/swift,kperryua/swift,adrfer/swift,harlanhaskins/swift,atrick/swift,jtbandes/swift,SwiftAndroid/swift,gottesmm/swift,sschiau/swift,brentdax/swift,jmgc/swift,sdulal/swift,Ivacker/swift,jckarter/swift,jtbandes/swift,MukeshKumarS/Swift,harlanhaskins/swift,lorentey/swift,swiftix/swift,therealbnut/swift,slavapestov/swift,arvedviehweger/swift,devincoughlin/swift,ben-ng/swift,kusl/swift,CodaFi/swift,CodaFi/swift,russbishop/swift,tkremenek/swift,hooman/swift,tjw/swift,uasys/swift,manavgabhawala/swift,shahmishal/swift,swiftix/swift.old,russbishop/swift,airspeedswift/swift,sdulal/swift,adrfer/swift,cbrentharris/swift,kusl/swift,airspeedswift/swift,atrick/swift,kstaring/swift,nathawes/swift,djwbrown/swift,karwa/swift,atrick/swift,uasys/swift,tkremenek/swift,parkera/swift,OscarSwanros/swift,codestergit/swift,ahoppen/swift,calebd/swift,gribozavr/swift,swiftix/swift,tkremenek/swift,mightydeveloper/swift,huonw/swift,calebd/swift,felix91gr/swift,dduan/swift,danielmartin/swift,LeoShimonaka/swift,roambotics/swift,modocache/swift,tjw/swift,russbishop/swift,amraboelela/swift,JaSpa/swift,austinzheng/swift,stephentyrone/swift,gregomni/swift,cbrentharris/swift,hughbe/swift,shajrawi/swift,swiftix/swift,felix91gr/swift,ken0nek/swift,LeoShimonaka/swift,kstaring/swift,tardieu/swift,kentya6/swift,emilstahl/swift,brentdax/swift,JGiola/swift,allevato/swift,natecook1000/swift,ken0nek/swift,johnno1962d/swift,dduan/swift,jopamer/swift,karwa/swift,adrfer/swift,devincoughlin/swift,arvedviehweger/swift,roambotics/swift,shajrawi/swift,jmgc/swift,allevato/swift,LeoShimonaka/swift,tkremenek/swift,kusl/swift,OscarSwanros/swift,calebd/swift,hooman/swift,jtbandes/swift,KrishMunot/swift,rudkx/swift,SwiftAndroid/swift,xedin/swift,tinysun212/swift-windows,mightydeveloper/swift,amraboelela/swift,allevato/swift,felix91gr/swift,SwiftAndroid/swift,austinzheng/swift,lorentey/swift,tkremenek/swift,kstaring/swift,frootloops/swift,devincoughlin/swift,OscarSwanros/swift,tjw/swift,amraboelela/swift,tinysun212/swift-windows,tardieu/swift,OscarSwanros/swift,Ivacker/swift,return/swift,khizkhiz/swift,kstaring/swift,jtbandes/swift,natecook1000/swift,kperryua/swift,khizkhiz/swift,bitjammer/swift,shajrawi/swift,practicalswift/swift,gmilos/swift,felix91gr/swift,karwa/swift,gregomni/swift,codestergit/swift,danielmartin/swift,kperryua/swift,IngmarStein/swift,kstaring/swift,xedin/swift,kentya6/swift,swiftix/swift.old,jtbandes/swift,felix91gr/swift,austinzheng/swift,dduan/swift,aschwaighofer/swift,jmgc/swift,tardieu/swift,milseman/swift,devincoughlin/swift,kentya6/swift,LeoShimonaka/swift,shahmishal/swift,russbishop/swift,uasys/swift,calebd/swift,LeoShimonaka/swift,KrishMunot/swift,mightydeveloper/swift,gottesmm/swift,karwa/swift,allevato/swift,nathawes/swift,xwu/swift,huonw/swift,apple/swift,tjw/swift,bitjammer/swift,kperryua/swift,gribozavr/swift,Ivacker/swift,dreamsxin/swift,JaSpa/swift,deyton/swift,JGiola/swift,zisko/swift,natecook1000/swift,dduan/swift,stephentyrone/swift,cbrentharris/swift,swiftix/swift.old,OscarSwanros/swift,kusl/swift,nathawes/swift,JaSpa/swift,danielmartin/swift,tinysun212/swift-windows,JaSpa/swift,gribozavr/swift,roambotics/swift,slavapestov/swift,modocache/swift,slavapestov/swift,jckarter/swift,Jnosh/swift,kstaring/swift,JGiola/swift,tjw/swift,sdulal/swift,frootloops/swift,xwu/swift,bitjammer/swift,return/swift,xwu/swift,dduan/swift,danielmartin/swift,st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