Fix a dynamic symbol lookup issue in interpreter mode.
Fix a dynamic symbol lookup issue in interpreter mode.

This was a very subtle bug, which occurred only in interpreter mode under Linux.
The actual name of the symbol should be artificially prefixed by an underscore,
because this underscore is stripped during a symbol lookup in interpreter mode.
If this is not done, then a reference to variable "_x" is being resolved as a reference
to the function "x"!

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