Allow -explicit-swift-module-map-file without full explicit module build#39887

nkcsgexi merged 1 commit intoswiftlang:mainswiftlang/swift:mainfrom

keith:ks/allow-explicit-swift-module-map-file-without-full-explicit-module-buildkeith/swift:ks/allow-explicit-swift-module-map-file-without-full-explicit-module-buildCopy head branch name to clipboard