Support for x86_64 watchOS simulator
* Start testing watchOS simulator x86_64 and i386 by default
Users will require to install watchOS 6.2 or older simulator to support i386.
1. Install watchOS 6.2 or older simulator (Xcode -> Preferences -> Components -> Simulators).
2. Create a 32-bit watchOS device.
3. Run:
`xcrun simctl create 'Apple Watch Series 2 - 42mm' com.apple.CoreSimulator.SimDeviceType.Apple-Watch-Series-2-42mm com.apple.CoreSimulator.SimRuntime.watchOS-6-2`
(cherry picked from commit b5a01ba5e07a37e7a8c87917e9da757548b24546)
* Update IRGen abitypes test to support watchOS simulator x86_64
