[Serialization] Move one case in getDeclCheckedImpl out of line
[Serialization] Move one case in getDeclCheckedImpl out of line

...as a proof of concept. The next commit will move them /all/ out of
line.

(The intent here is to produce better backtraces when not recovering
from errors.)

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