Support building only tests using SwiftPM #851
Merged
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Companion of swiftlang/swift#76900
This allows us to build everything required for the executable using CMake and only the test targets using SwiftPM, enabling us to run tests on Windows from build.ps1 with minimal overhead.
Compared to #841, this allows us to re-use
SwiftFormat.dll
from the CMake build on Windows, reducing the amount of code that needs to get built and testing the libraries that will actually be shipped in the toolchain.