Decoupling Swift Compiler and Runtime Testing

Decoupling Swift Compiler and Runtime Testing The Swift compiler and runtime execution testing are tightly coupled to the internal layout of the compiler build directory. This prevents testing installed SDK layouts, complicates cross-compilation, and creates significant CI bottlenecks. This proposal outlines a strategy to decouple the test suite into three independent categories: Compiler Tests: Tests that verify the output of the compiler using a mock SDK but do not depend on the runtime. E...