[basic] Add comparison operators to NullablePtr<T> against T* and other NullablePtr<T>.
[basic] Add comparison operators to NullablePtr<T> against T* and other NullablePtr<T>.

It is always safe to compare a nullptr with a non-null pointer.

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