Make test run only on x86_64/macos to fix arm64 macos bots.
Make test run only on x86_64/macos to fix arm64 macos bots.

The reason why the test fails in this case is that it uses FileCheck on machine
specific LLVM-IR so the filechecking is not platform independent.

glessard/swift,atrick/swift,rudkx/swift,ahoppen/swift,roambotics/swift,gregomni/swift,benlangmuir/swift,JGiola/swift,rudkx/swift,JGiola/swift,atrick/swift,JGiola/swift,JGiola/swift,benlangmuir/swift,roambotics/swift,glessard/swift,atrick/swift,apple/swift,apple/swift,rudkx/swift,benlangmuir/swift,ahoppen/swift,rudkx/swift,ahoppen/swift,ahoppen/swift,gregomni/swift,glessard/swift,benlangmuir/swift,roambotics/swift,roambotics/swift,apple/swift,glessard/swift,gregomni/swift,gregomni/swift,glessard/swift,benlangmuir/swift,apple/swift,roambotics/swift,apple/swift,rudkx/swift,gregomni/swift,atrick/swift,JGiola/swift,apple/swift,rudkx/swift,JGiola/swift,gregomni/swift,ahoppen/swift,ahoppen/swift,atrick/swift,benlangmuir/swift,roambotics/swift,glessard/swift,atrick/swift