Hard-code the 'Darwin' module as having been built without C++ interop

Textual interfaces for 'Darwin' built with recent compilers specify that it is built witout C++ interop enabled. However, to ensure compatibility with versions of the 'Darwin' module built with older compilers, we hard-code this fact. This is required to break the module cycle that occurs when building the 'Darwin' module with C++ interop enabled, where the underlying 'Darwin' clang module depends on C++ standard library for which the compiler brings in the 'CxxStdlib' Swift overlay, which depends on 'Darwin'.

lib/DriverTool/swift_symbolgraph_extract_main.cpp

@@ -214,7 +214,8 @@ int swift_symbolgraph_extract_main(ArrayRef<const char *> Args,
     Options.AvailabilityIsBlockList = A->getOption().matches(OPT_block_availability_platforms);
   }
 
-  Invocation.getLangOptions().setCxxInteropFromArgs(ParsedArgs, Diags);
+  Invocation.getLangOptions().setCxxInteropFromArgs(ParsedArgs, Diags,
+                                                    Invocation.getFrontendOptions());
 
   std::string InstanceSetupError;
   if (CI.setup(Invocation, InstanceSetupError)) {