Revert "[stable-merge] [IRGen] Adopt new coverage encoding API"
Revert "[stable-merge] [IRGen] Adopt new coverage encoding API"

This reverts commit 4a7ba9c580791b7ba557d1275c1476f217ef2d00. I reverted
this API out of llvm to investigate failures in our stage2 instrumented
builds.

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