runtime: add undecoration support for Windows
runtime: add undecoration support for Windows

Use the Windows API `UnDecorateSymbolName` rather than `__cxa_demangle`
to undecorate the C++ symbols.  `__cxa_demangle` is only available in
the itanium ABI, not under MS ABI.  This allows us to properly
undecorate symbols on Windows.

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