Improve symbolication of stacktraces on Linux.
Improve symbolication of stacktraces on Linux.

* Finds lldb site-package relative to swift executable
* Caches lldb target for better performance
* Assumes stdin as the log source

swiftix/swift,swiftix/swift,tkremenek/swift,hooman/swift,sschiau/swift,natecook1000/swift,benlangmuir/swift,aschwaighofer/swift,allevato/swift,brentdax/swift,JGiola/swift,nathawes/swift,zisko/swift,CodaFi/swift,shahmishal/swift,gribozavr/swift,shajrawi/swift,xwu/swift,OscarSwanros/swift,devincoughlin/swift,tjw/swift,shajrawi/swift,jopamer/swift,zisko/swift,swiftix/swift,calebd/swift,jmgc/swift,felix91gr/swift,return/swift,danielmartin/swift,karwa/swift,benlangmuir/swift,calebd/swift,austinzheng/swift,milseman/swift,atrick/swift,airspeedswift/swift,brentdax/swift,frootloops/swift,atrick/swift,deyton/swift,glessard/swift,djwbrown/swift,zisko/swift,jckarter/swift,natecook1000/swift,parkera/swift,jckarter/swift,tjw/swift,parkera/swift,austinzheng/swift,xwu/swift,airspeedswift/swift,hooman/swift,jopamer/swift,return/swift,benlangmuir/swift,amraboelela/swift,xedin/swift,hooman/swift,glessard/swift,atrick/swift,xwu/swift,swiftix/swift,nathawes/swift,jckarter/swift,gribozavr/swift,felix91gr/swift,xedin/swift,deyton/swift,jmgc/swift,xedin/swift,zisko/swift,nathawes/swift,shajrawi/swift,gribozavr/swift,practicalswift/swift,ahoppen/swift,alblue/swift,apple/swift,calebd/swift,CodaFi/swift,swiftix/swift,atrick/swift,jckarter/swift,milseman/swift,aschwaighofer/swift,sschiau/swift,huonw/swift,CodaFi/swift,sschiau/swift,allevato/swift,djwbrown/swift,return/swift,lorentey/swift,huonw/swift,apple/swift,calebd/swift,karwa/swift,ahoppen/swift,milseman/swift,jopamer/swift,uasys/swift,benlangmuir/swift,shahmishal/swift,devincoughlin/swift,rudkx/swift,JGiola/swift,allevato/swift,nathawes/swift,OscarSwanros/swift,xedin/swift,airspeedswift/swift,karwa/swift,glessard/swift,shajrawi/swift,deyton/swift,shahmishal/swift,austinzheng/swift,gregomni/swift,frootloops/swift,airspeedswift/swift,austinzheng/swift,milseman/swift,danielmartin/swift,shahmishal/swift,frootloops/swift,stephentyrone/swift,amraboelela/swift,frootloops/swift,jopamer/swift,OscarSwanros/swift,glessard/swift,parkera/swift,deyton/swift,stephentyrone/swift,felix91gr/swift,JGiola/swift,shahmishal/swift,OscarSwanros/swift,CodaFi/swift,OscarSwanros/swift,brentdax/swift,jopamer/swift,JGiola/swift,gregomni/swift,gribozavr/swift,austinzheng/swift,shahmishal/swift,parkera/swift,devincoughlin/swift,danielmartin/swift,jmgc/swift,jckarter/swift,austinzheng/swift,danielmartin/swift,milseman/swift,tkremenek/swift,atrick/swift,frootloops/swift,glessard/swift,gribozavr/swift,natecook1000/swift,allevato/swift,hughbe/swift,jmgc/swift,milseman/swift,gribozavr/swift,huonw/swift,amraboelela/swift,hughbe/swift,deyton/swift,rudkx/swift,tkremenek/swift,alblue/swift,parkera/swift,tjw/swift,gribozavr/swift,felix91gr/swift,tkremenek/swift,stephentyrone/swift,shajrawi/swift,return/swift,practicalswift/swift,karwa/swift,brentdax/swift,aschwaighofer/swift,lorentey/swift,JGiola/swift,devincoughlin/swift,allevato/swift,amraboelela/swift,apple/swift,lorentey/swift,sschiau/swift,allevato/swift,amraboelela/swift,devincoughlin/swift,parkera/swift,jckarter/swift,calebd/swift,swiftix/swift,parkera/swift,natecook1000/swift,lorentey/swift,practicalswift/swift,djwbrown/swift,harlanhaskins/swift,hughbe/swift,jckarter/swift,harlanhaskins/swift,hooman/swift,airspeedswift/swift,tkremenek/swift,rudkx/swift,karwa/swift,tkremenek/swift,hooman/swift,harlanhaskins/swift,practicalswift/swift,roambotics/swift,xedin/swift,CodaFi/swift,xwu/swift,karwa/swift,parkera/swift,zisko/swift,swiftix/swift,shajrawi/swift,nathawes/swift,danielmartin/swift,jmgc/swift,stephentyrone/swift,tjw/swift,xwu/swift,alblue/swift,shahmishal/swift,return/swift,return/swift,alblue/swift,sschiau/swift,airspeedswift/swift,natecook1000/swift,tkremenek/swift,hooman/swift,hooman/swift,jmgc/swift,tjw/swift,uasys/swift,uasys/swift,uasys/swift,roambotics/swift,devincoughlin/swift,hughbe/swift,xedin/swift,rudkx/swift,sschiau/swift,xedin/swift,gregomni/swift,lorentey/swift,harlanhaskins/swift,practicalswift/swift,amraboelela/swift,JGiola/swift,OscarSwanros/swift,tjw/swift,karwa/swift,jmgc/swift,stephentyrone/swift,nathawes/swift,deyton/swift,xwu/swift,frootloops/swift,allevato/swift,rudkx/swift,calebd/swift,alblue/swift,uasys/swift,tjw/swift,apple/swift,alblue/swift,aschwaighofer/swift,practicalswift/swift,practicalswift/swift,gregomni/swift,austinzheng/swift,gribozavr/swift,zisko/swift,natecook1000/swift,devincoughlin/swift,huonw/swift,CodaFi/swift,jopamer/swift,felix91gr/swift,aschwaighofer/swift,djwbrown/swift,rudkx/swift,ahoppen/swift,stephentyrone/swift,roambotics/swift,felix91gr/swift,djwbrown/swift,sschiau/swift,shahmishal/swift,lorentey/swift,shajrawi/swift,apple/swift,natecook1000/swift,ahoppen/swift,gregomni/swift,hughbe/swift,atrick/swift,djwbrown/swift,huonw/swift,danielmartin/swift,roambotics/swift,amraboelela/swift,benlangmuir/swift,huonw/swift,ahoppen/swift,benlangmuir/swift,harlanhaskins/swift,lorentey/swift,brentdax/swift,hughbe/swift,uasys/swift,huonw/swift,deyton/swift,aschwaighofer/swift,danielmartin/swift,felix91gr/swift,roambotics/swift,ahoppen/swift,lorentey/swift,xedin/swift,karwa/swift,apple/swift,OscarSwanros/swift,aschwaighofer/swift,gregomni/swift,roambotics/swift,hughbe/swift,frootloops/swift,glessard/swift,shajrawi/swift,harlanhaskins/swift,jopamer/swift,harlanhaskins/swift,djwbrown/swift,CodaFi/swift,practicalswift/swift,airspeedswift/swift,nathawes/swift,zisko/swift,xwu/swift,return/swift,uasys/swift,calebd/swift,sschiau/swift,brentdax/swift,stephentyrone/swift,brentdax/swift,alblue/swift,milseman/swift,devincoughlin/swift