swift

f301746f - Simplifies PlaygroundTransform tests by moving boilerplate code to a macro.

Simplifies PlaygroundTransform tests by moving boilerplate code to a macro. Defines the %target-playground-build-run-swift macro in the local lit config for PlaygroundTransform which contains all the boilerplate code used by most PlaygroundTransform tests: * Build a PlaygroundSupport module * Build the test source into an executable, linking PlaygroundSupport * Codesign and run the executable