[test] Weaken a test in coverage_smoke.swift
[test] Weaken a test in coverage_smoke.swift

The test regressed after D85036. rdar://67280997 tracks a proper fix for
this issue.

JGiola/swift,parkera/swift,atrick/swift,hooman/swift,apple/swift,benlangmuir/swift,xwu/swift,gregomni/swift,rudkx/swift,roambotics/swift,ahoppen/swift,roambotics/swift,rudkx/swift,tkremenek/swift,tkremenek/swift,gregomni/swift,xwu/swift,atrick/swift,benlangmuir/swift,gregomni/swift,xwu/swift,benlangmuir/swift,roambotics/swift,gregomni/swift,tkremenek/swift,atrick/swift,benlangmuir/swift,JGiola/swift,glessard/swift,parkera/swift,hooman/swift,gregomni/swift,JGiola/swift,roambotics/swift,JGiola/swift,glessard/swift,apple/swift,benlangmuir/swift,xwu/swift,apple/swift,parkera/swift,rudkx/swift,JGiola/swift,parkera/swift,atrick/swift,rudkx/swift,xwu/swift,atrick/swift,hooman/swift,ahoppen/swift,JGiola/swift,parkera/swift,apple/swift,xwu/swift,tkremenek/swift,hooman/swift,glessard/swift,roambotics/swift,hooman/swift,ahoppen/swift,tkremenek/swift,rudkx/swift,apple/swift,hooman/swift,parkera/swift,hooman/swift,tkremenek/swift,parkera/swift,apple/swift,ahoppen/swift,gregomni/swift,rudkx/swift,glessard/swift,tkremenek/swift,xwu/swift,roambotics/swift,glessard/swift,ahoppen/swift,benlangmuir/swift,parkera/swift,glessard/swift,atrick/swift,ahoppen/swift