[test] Fix ClangImporter test on IBM Z
[test] Fix ClangImporter test on IBM Z

The calling convention on IBM Z requires that arguments are sign or
zero extended to register width, so optionally allow that.

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