swift

30963608 - Roll back to watchOS 6.0 to keep armv7k support

Roll back to watchOS 6.0 to keep armv7k support While the swift compiler in Xcode links against tbd files in the sdk that contain an armv7k slice, the open source swift toolchain links against the stdlib dylb that is in the toolchain itself. This means that we cannot drop support for armv7k support in the stdlib dylib without losing support for building armv7k when back deploying to older watch targets. For now, roll back the recent deployment target bump from 9.0 to 6.0 so that we keep armv7k and i386 simulator. rdar://135560598 (cherry picked from commit 46a83bea0ceb7e711a5d14b236bf1c7612057f3f) (cherry picked from commit aa9de4d7ef2ea97e819db8c0ad9a18ca604de51e)