Use params files on macOS for Swift 4.2 and higher.
Use params files on macOS for Swift 4.2 and higher.

RELNOTES: f2cfcd0613e283f9971b4718028a2e93eb3ee647@params.txt`) for
versions of Xcode that support it (10.0 and higher).
PiperOrigin-RevId: 213683724

bazelbuild/rules_swift,bazelbuild/rules_swift