[Diagnostics] Undefining REMARK macro.
[Diagnostics] Undefining REMARK macro.

Follow up on fix for SR-10915 where I forgot to undefine the REMARK
macro.

ref: https://github.com/apple/swift/pull/25585

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