[cxx-interop] Do not emit C++ interop flag in textual interfaces

This change is a counterpart of swiftlang/swift#77754.

rdar://140203932

Sources/SwiftOptions/Options.swift

@@ -104,7 +104,7 @@ extension Option {
   public static let crosscheckUnqualifiedLookup: Option = Option("-crosscheck-unqualified-lookup", .flag, attributes: [.frontend, .noDriver], helpText: "Compare legacy DeclContext- to ASTScope-based unqualified name lookup (for debugging)")
   public static let cxxInteropGettersSettersAsProperties: Option = Option("-cxx-interop-getters-setters-as-properties", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Import getters and setters as computed properties in Swift")
   public static let cxxInteropUseOpaquePointerForMoveonly: Option = Option("-cxx-interop-use-opaque-pointer-for-moveonly", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Testing flag that will be eliminated soon. Do not use.")
-  public static let cxxInteroperabilityMode: Option = Option("-cxx-interoperability-mode=", .joined, attributes: [.frontend, .synthesizeInterface, .moduleInterface], helpText: "Enables C++ interoperability; pass 'default' to enable or 'off' to disable")
+  public static let cxxInteroperabilityMode: Option = Option("-cxx-interoperability-mode=", .joined, attributes: [.frontend, .synthesizeInterface], helpText: "Enables C++ interoperability; pass 'default' to enable or 'off' to disable")
   public static let c: Option = Option("-c", .flag, alias: Option.emitObject, attributes: [.frontend, .noInteractive], group: .modes)
   public static let debugAssertAfterParse: Option = Option("-debug-assert-after-parse", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Force an assertion failure after parsing", group: .debugCrash)
   public static let debugAssertImmediately: Option = Option("-debug-assert-immediately", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Force an assertion failure immediately", group: .debugCrash)
@@ -417,7 +417,7 @@ extension Option {
   public static let enableExperimentalAsyncTopLevel: Option = Option("-enable-experimental-async-top-level", .flag, attributes: [.helpHidden, .frontend, .noDriver, .moduleInterface], helpText: "Enable experimental concurrency in top-level code")
   public static let enableExperimentalConcisePoundFile: Option = Option("-enable-experimental-concise-pound-file", .flag, attributes: [.frontend, .moduleInterface], helpText: "Enable experimental concise '#file' identifier")
   public static let enableExperimentalConcurrency: Option = Option("-enable-experimental-concurrency", .flag, attributes: [.helpHidden, .frontend, .noDriver, .moduleInterface], helpText: "Enable experimental concurrency model")
-  public static let enableExperimentalCxxInterop: Option = Option("-enable-experimental-cxx-interop", .flag, attributes: [.helpHidden, .frontend, .noDriver, .moduleInterface], helpText: "Enable experimental C++ interop code generation and config directives")
+  public static let enableExperimentalCxxInterop: Option = Option("-enable-experimental-cxx-interop", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Enable experimental C++ interop code generation and config directives")
   public static let enableExperimentalDistributed: Option = Option("-enable-experimental-distributed", .flag, attributes: [.helpHidden, .frontend, .noDriver, .moduleInterface], helpText: "Enable experimental 'distributed' actors and functions")
   public static let enableExperimentalEagerClangModuleDiagnostics: Option = Option("-enable-experimental-eager-clang-module-diagnostics", .flag, attributes: [.helpHidden, .frontend, .noDriver, .moduleInterface], helpText: "Enable experimental eager diagnostics reporting on the importability of all referenced C, C++, and Objective-C libraries")
   public static let enableExperimentalFeature: Option = Option("-enable-experimental-feature", .separate, attributes: [.frontend, .moduleInterface], helpText: "Enable an experimental feature")