AST: switch to `std::sort` from `llvm::array_pod_sort`
AST: switch to `std::sort` from `llvm::array_pod_sort`

Swap the `array_pod_sort` to `sort`.  `array_pod_sort` is meant to be
used with POD types only.  Switching to `std:sort` should be slightly
faster, and more importantly, allows the emission of the warnings on
Windows to be sorted identically to Linux and macOS.

stephentyrone/swift,lorentey/swift,karwa/swift,harlanhaskins/swift,gregomni/swift,jckarter/swift,jckarter/swift,sschiau/swift,jmgc/swift,atrick/swift,xwu/swift,nathawes/swift,gribozavr/swift,nathawes/swift,devincoughlin/swift,apple/swift,stephentyrone/swift,sschiau/swift,xedin/swift,lorentey/swift,atrick/swift,lorentey/swift,gribozavr/swift,harlanhaskins/swift,shajrawi/swift,aschwaighofer/swift,devincoughlin/swift,shahmishal/swift,gribozavr/swift,JGiola/swift,shajrawi/swift,gribozavr/swift,karwa/swift,allevato/swift,benlangmuir/swift,stephentyrone/swift,xwu/swift,devincoughlin/swift,glessard/swift,xedin/swift,stephentyrone/swift,shahmishal/swift,atrick/swift,sschiau/swift,shahmishal/swift,hooman/swift,roambotics/swift,shahmishal/swift,tkremenek/swift,JGiola/swift,nathawes/swift,CodaFi/swift,gregomni/swift,glessard/swift,shajrawi/swift,gribozavr/swift,sschiau/swift,allevato/swift,atrick/swift,airspeedswift/swift,tkremenek/swift,shahmishal/swift,apple/swift,parkera/swift,xwu/swift,glessard/swift,devincoughlin/swift,rudkx/swift,lorentey/swift,airspeedswift/swift,tkremenek/swift,ahoppen/swift,lorentey/swift,roambotics/swift,parkera/swift,xwu/swift,allevato/swift,karwa/swift,jckarter/swift,jmgc/swift,benlangmuir/swift,xwu/swift,devincoughlin/swift,nathawes/swift,stephentyrone/swift,ahoppen/swift,gregomni/swift,benlangmuir/swift,lorentey/swift,xedin/swift,ahoppen/swift,devincoughlin/swift,roambotics/swift,nathawes/swift,gregomni/swift,tkremenek/swift,shahmishal/swift,rudkx/swift,allevato/swift,hooman/swift,roambotics/swift,jmgc/swift,karwa/swift,JGiola/swift,nathawes/swift,parkera/swift,sschiau/swift,ahoppen/swift,harlanhaskins/swift,shajrawi/swift,CodaFi/swift,xedin/swift,glessard/swift,hooman/swift,karwa/swift,gribozavr/swift,sschiau/swift,gregomni/swift,airspeedswift/swift,CodaFi/swift,allevato/swift,harlanhaskins/swift,allevato/swift,xedin/swift,parkera/swift,tkremenek/swift,aschwaighofer/swift,CodaFi/swift,rudkx/swift,allevato/swift,rudkx/swift,jckarter/swift,CodaFi/swift,rudkx/swift,glessard/swift,aschwaighofer/swift,nathawes/swift,jmgc/swift,gribozavr/swift,karwa/swift,stephentyrone/swift,JGiola/swift,parkera/swift,ahoppen/swift,roambotics/swift,xwu/swift,lorentey/swift,rudkx/swift,CodaFi/swift,gregomni/swift,xedin/swift,jckarter/swift,hooman/swift,shajrawi/swift,benlangmuir/swift,xwu/swift,xedin/swift,apple/swift,karwa/swift,benlangmuir/swift,hooman/swift,tkremenek/swift,airspeedswift/swift,shahmishal/swift,hooman/swift,airspeedswift/swift,roambotics/swift,glessard/swift,aschwaighofer/swift,apple/swift,shajrawi/swift,karwa/swift,atrick/swift,jmgc/swift,airspeedswift/swift,parkera/swift,apple/swift,sschiau/swift,jmgc/swift,shahmishal/swift,parkera/swift,benlangmuir/swift,ahoppen/swift,gribozavr/swift,atrick/swift,harlanhaskins/swift,JGiola/swift,aschwaighofer/swift,stephentyrone/swift,jckarter/swift,aschwaighofer/swift,tkremenek/swift,shajrawi/swift,harlanhaskins/swift,devincoughlin/swift,hooman/swift,JGiola/swift,jckarter/swift,sschiau/swift,airspeedswift/swift,aschwaighofer/swift,CodaFi/swift,shajrawi/swift,parkera/swift,xedin/swift,devincoughlin/swift,harlanhaskins/swift,apple/swift,jmgc/swift,lorentey/swift