[Basic] Update for fs::createUniqueFile changes in llvm
[Basic] Update for fs::createUniqueFile changes in llvm

https://reviews.llvm.org/D97785 reintroduced a flags parameter to `fs::createUniqueFile`, this time preceding `params`. (Compare: https://github.com/apple/swift/pull/18472)

rdar://76036856

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