Default implementation of instance bitWidth for FixedWidthInteger
Default implementation of instance bitWidth for FixedWidthInteger

Conforming types already provide the static bitWidth property. Instance
one can be implemented in a protocol extension.

Resolves: <rdar://problem/30186638>

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