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Before #82571, we would generate a binary swiftmodule file at `<build folder>/<module>.swiftmodule`, while now in the same location we generate a directory. Trying an incremental run on top of a build folder generated with the old logic will fail during configuration with an error similar to ``` CMake Error at .../Supplemental/cmake/modules/EmitSwiftInterface.cmake:21 (file): file failed to create directory: .../StringProcessing-build/_RegexParser/_RegexParser.swiftmodule because: File exists ``` To reduce churn in CI and at desk, delete such remnant from the previous logic. Addresses rdar://155466197