[AST] Make sure the contents of GenericEnvironments get deallocated.
[AST] Make sure the contents of GenericEnvironments get deallocated.

ASTContext-allocated objects don't get destructed unless they are
registered; make sure to do that for GenericEnvironments, because
we're leaking them like crazy.

hooman/swift,jtbandes/swift,gmilos/swift,alblue/swift,deyton/swift,calebd/swift,return/swift,deyton/swift,jopamer/swift,tkremenek/swift,danielmartin/swift,swiftix/swift,devincoughlin/swift,Jnosh/swift,harlanhaskins/swift,shajrawi/swift,brentdax/swift,bitjammer/swift,manavgabhawala/swift,natecook1000/swift,parkera/swift,apple/swift,djwbrown/swift,xwu/swift,tjw/swift,devincoughlin/swift,harlanhaskins/swift,gregomni/swift,harlanhaskins/swift,brentdax/swift,ben-ng/swift,JaSpa/swift,huonw/swift,manavgabhawala/swift,frootloops/swift,jmgc/swift,atrick/swift,swiftix/swift,jmgc/swift,practicalswift/swift,frootloops/swift,CodaFi/swift,uasys/swift,zisko/swift,nathawes/swift,zisko/swift,calebd/swift,swiftix/swift,jmgc/swift,nathawes/swift,xedin/swift,hooman/swift,JGiola/swift,xwu/swift,shajrawi/swift,Jnosh/swift,airspeedswift/swift,tardieu/swift,gottesmm/swift,jckarter/swift,alblue/swift,benlangmuir/swift,JGiola/swift,felix91gr/swift,milseman/swift,jtbandes/swift,JaSpa/swift,atrick/swift,tardieu/swift,hughbe/swift,huonw/swift,aschwaighofer/swift,aschwaighofer/swift,sschiau/swift,parkera/swift,arvedviehweger/swift,tjw/swift,danielmartin/swift,rudkx/swift,alblue/swift,gribozavr/swift,ahoppen/swift,gregomni/swift,tinysun212/swift-windows,harlanhaskins/swift,aschwaighofer/swift,nathawes/swift,gregomni/swift,parkera/swift,glessard/swift,tinysun212/swift-windows,uasys/swift,ben-ng/swift,therealbnut/swift,JaSpa/swift,CodaFi/swift,glessard/swift,atrick/swift,gottesmm/swift,gribozavr/swift,jckarter/swift,austinzheng/swift,jtbandes/swift,practicalswift/swift,therealbnut/swift,huonw/swift,rudkx/swift,gmilos/swift,airspeedswift/swift,therealbnut/swift,shahmishal/swift,apple/swift,natecook1000/swift,amraboelela/swift,devincoughlin/swift,jckarter/swift,stephentyrone/swift,benlangmuir/swift,tjw/swift,amraboelela/swift,glessard/swift,codestergit/swift,practicalswift/swift,djwbrown/swift,parkera/swift,shahmishal/swift,JGiola/swift,amraboelela/swift,amraboelela/swift,jopamer/swift,lorentey/swift,therealbnut/swift,atrick/swift,shahmishal/swift,ben-ng/swift,roambotics/swift,ben-ng/swift,apple/swift,karwa/swift,danielmartin/swift,calebd/swift,hughbe/swift,zisko/swift,JaSpa/swift,brentdax/swift,xwu/swift,karwa/swift,danielmartin/swift,swiftix/swift,zisko/swift,natecook1000/swift,hooman/swift,hughbe/swift,sschiau/swift,xedin/swift,jtbandes/swift,ahoppen/swift,karwa/swift,jopamer/swift,austinzheng/swift,amraboelela/swift,CodaFi/swift,uasys/swift,apple/swift,arvedviehweger/swift,rudkx/swift,bitjammer/swift,return/swift,natecook1000/swift,xedin/swift,lorentey/swift,tinysun212/swift-windows,jtbandes/swift,return/swift,benlangmuir/swift,jtbandes/swift,stephentyrone/swift,gribozavr/swift,brentdax/swift,calebd/swift,OscarSwanros/swift,frootloops/swift,nathawes/swift,OscarSwanros/swift,Jnosh/swift,roambotics/swift,gmilos/swift,practicalswift/swift,stephentyrone/swift,nathawes/swift,hughbe/swift,manavgabhawala/swift,jopamer/swift,ahoppen/swift,JGiola/swift,glessard/swift,sschiau/swift,deyton/swift,tinysun212/swift-windows,arvedviehweger/swift,gregomni/swift,gribozavr/swift,gottesmm/swift,alblue/swift,swiftix/swift,manavgabhawala/swift,allevato/swift,devincoughlin/swift,nathawes/swift,stephentyrone/swift,lorentey/swift,huonw/swift,shahmishal/swift,karwa/swift,bitjammer/swift,allevato/swift,ben-ng/swift,brentdax/swift,practicalswift/swift,felix91gr/swift,felix91gr/swift,OscarSwanros/swift,uasys/swift,stephentyrone/swift,glessard/swift,allevato/swift,calebd/swift,milseman/swift,tardieu/swift,ahoppen/swift,brentdax/swift,atrick/swift,bitjammer/swift,danielmartin/swift,hooman/swift,airspeedswift/swift,austinzheng/swift,tardieu/swift,allevato/swift,gregomni/swift,felix91gr/swift,gribozavr/swift,milseman/swift,codestergit/swift,frootloops/swift,danielmartin/swift,jopamer/swift,aschwaighofer/swift,codestergit/swift,jopamer/swift,tkremenek/swift,austinzheng/swift,allevato/swift,arvedviehweger/swift,gribozavr/swift,jmgc/swift,hooman/swift,JaSpa/swift,tjw/swift,deyton/swift,frootloops/swift,uasys/swift,djwbrown/swift,ahoppen/swift,natecook1000/swift,amraboelela/swift,return/swift,austinzheng/swift,tkremenek/swift,tinysun212/swift-windows,lorentey/swift,deyton/swift,karwa/swift,gottesmm/swift,huonw/swift,brentdax/swift,manavgabhawala/swift,milseman/swift,uasys/swift,shajrawi/swift,therealbnut/swift,codestergit/swift,hughbe/swift,zisko/swift,shahmishal/swift,ben-ng/swift,therealbnut/swift,lorentey/swift,austinzheng/swift,djwbrown/swift,milseman/swift,JaSpa/swift,xwu/swift,stephentyrone/swift,OscarSwanros/swift,gregomni/swift,apple/swift,danielmartin/swift,aschwaighofer/swift,roambotics/swift,swiftix/swift,Jnosh/swift,gmilos/swift,gmilos/swift,felix91gr/swift,djwbrown/swift,hooman/swift,milseman/swift,jmgc/swift,zisko/swift,JGiola/swift,manavgabhawala/swift,sschiau/swift,parkera/swift,return/swift,deyton/swift,xedin/swift,shajrawi/swift,huonw/swift,zisko/swift,parkera/swift,rudkx/swift,bitjammer/swift,Jnosh/swift,rudkx/swift,jopamer/swift,gottesmm/swift,ben-ng/swift,arvedviehweger/swift,gmilos/swift,shajrawi/swift,karwa/swift,allevato/swift,tkremenek/swift,airspeedswift/swift,allevato/swift,alblue/swift,xwu/swift,djwbrown/swift,CodaFi/swift,tinysun212/swift-windows,return/swift,atrick/swift,arvedviehweger/swift,calebd/swift,sschiau/swift,CodaFi/swift,tardieu/swift,jckarter/swift,shahmishal/swift,lorentey/swift,JGiola/swift,milseman/swift,jmgc/swift,lorentey/swift,harlanhaskins/swift,roambotics/swift,natecook1000/swift,bitjammer/swift,JaSpa/swift,tkremenek/swift,return/swift,tkremenek/swift,xwu/swift,devincoughlin/swift,hughbe/swift,lorentey/swift,shajrawi/swift,harlanhaskins/swift,sschiau/swift,tinysun212/swift-windows,calebd/swift,glessard/swift,benlangmuir/swift,jmgc/swift,jckarter/swift,gottesmm/swift,OscarSwanros/swift,huonw/swift,CodaFi/swift,tjw/swift,natecook1000/swift,djwbrown/swift,shahmishal/swift,felix91gr/swift,manavgabhawala/swift,karwa/swift,practicalswift/swift,amraboelela/swift,codestergit/swift,roambotics/swift,CodaFi/swift,airspeedswift/swift,uasys/swift,jtbandes/swift,therealbnut/swift,karwa/swift,bitjammer/swift,tjw/swift,xwu/swift,apple/swift,devincoughlin/swift,tjw/swift,parkera/swift,shahmishal/swift,frootloops/swift,OscarSwanros/swift,nathawes/swift,practicalswift/swift,devincoughlin/swift,deyton/swift,austinzheng/swift,aschwaighofer/swift,airspeedswift/swift,tardieu/swift,hughbe/swift,alblue/swift,practicalswift/swift,frootloops/swift,tkremenek/swift,sschiau/swift,arvedviehweger/swift,harlanhaskins/swift,stephentyrone/swift,roambotics/swift,rudkx/swift,gottesmm/swift,Jnosh/swift,parkera/swift,xedin/swift,ahoppen/swift,hooman/swift,Jnosh/swift,gribozavr/swift,swiftix/swift,codestergit/swift,shajrawi/swift,codestergit/swift,OscarSwanros/swift,aschwaighofer/swift,benlangmuir/swift,gmilos/swift,xedin/swift,benlangmuir/swift,felix91gr/swift,tardieu/swift,shajrawi/swift,jckarter/swift,gribozavr/swift,airspeedswift/swift,xedin/swift,jckarter/swift,xedin/swift,devincoughlin/swift,sschiau/swift,alblue/swift