[NFC] Tighten up test for #31743
[NFC] Tighten up test for #31743

Tweak this test to only look for debug info references to the filename, not *any* reference to the filename.

airspeedswift/swift,ahoppen/swift,glessard/swift,airspeedswift/swift,jmgc/swift,glessard/swift,rudkx/swift,jmgc/swift,allevato/swift,hooman/swift,nathawes/swift,airspeedswift/swift,roambotics/swift,ahoppen/swift,apple/swift,nathawes/swift,atrick/swift,benlangmuir/swift,apple/swift,allevato/swift,jckarter/swift,CodaFi/swift,nathawes/swift,apple/swift,atrick/swift,xwu/swift,parkera/swift,parkera/swift,atrick/swift,atrick/swift,allevato/swift,nathawes/swift,hooman/swift,atrick/swift,jmgc/swift,roambotics/swift,jmgc/swift,xwu/swift,jckarter/swift,CodaFi/swift,glessard/swift,benlangmuir/swift,airspeedswift/swift,JGiola/swift,jckarter/swift,rudkx/swift,roambotics/swift,parkera/swift,jckarter/swift,hooman/swift,roambotics/swift,JGiola/swift,airspeedswift/swift,CodaFi/swift,glessard/swift,CodaFi/swift,allevato/swift,glessard/swift,CodaFi/swift,JGiola/swift,jmgc/swift,gregomni/swift,parkera/swift,hooman/swift,roambotics/swift,nathawes/swift,allevato/swift,atrick/swift,JGiola/swift,ahoppen/swift,gregomni/swift,tkremenek/swift,roambotics/swift,JGiola/swift,hooman/swift,jmgc/swift,JGiola/swift,xwu/swift,allevato/swift,apple/swift,rudkx/swift,parkera/swift,nathawes/swift,hooman/swift,ahoppen/swift,parkera/swift,CodaFi/swift,parkera/swift,ahoppen/swift,rudkx/swift,airspeedswift/swift,rudkx/swift,tkremenek/swift,jckarter/swift,tkremenek/swift,ahoppen/swift,nathawes/swift,CodaFi/swift,jckarter/swift,xwu/swift,allevato/swift,benlangmuir/swift,glessard/swift,gregomni/swift,jmgc/swift,tkremenek/swift,rudkx/swift,gregomni/swift,apple/swift,tkremenek/swift,benlangmuir/swift,jckarter/swift,gregomni/swift,hooman/swift,parkera/swift,benlangmuir/swift,airspeedswift/swift,xwu/swift,apple/swift,xwu/swift,tkremenek/swift,xwu/swift,tkremenek/swift,benlangmuir/swift,gregomni/swift