[BasicAA] Update on r259290 - added missing cast
[BasicAA] Update on r259290 - added missing cast

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@259298 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm