stdlib: Fix lifetime issues in ManagedBuffer.value
stdlib: Fix lifetime issues in ManagedBuffer.value

This property had unsafe addressors, but there was nothing that kept the
memory owner (the `self` reference) alive.

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