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b6367f723b
Add policy CMP0215 to emit `.swiftmodule` from a dedicated `-emit-module` build edge for importable Swift targets in the Ninja generator. Downstream targets can begin compiling as soon as the module interface is ready, overlapping with upstream object compilation and linking. When CMP0215 is NEW and CMP0157 is NEW, separate module emission is enabled by default. The `Swift_SEPARATE_MODULE_EMISSION` target property (initialized by the `CMAKE_Swift_SEPARATE_MODULE_EMISSION` variable) can override this per target. The compile edge still passes `-emit-module` so that swiftc continues to produce `.swiftdoc`; only the `.swiftmodule` output moves to the new edge. Also fix swiftmodule dependency edges in cmNinjaNormalTargetGenerator to use IsLanguageUsed instead of GetLinkerLanguage, so C/C++ targets whose linker language propagated to Swift do not produce spurious implicit dependencies. Closes: #27748