message: [SwiftASTContext] Document GetAnyObjectType.
diff: @@ -294,6 +294,7 @@ public:
  CompilerType GetTypeFromMangledTypename(const char *mangled_typename,
  Status &error);
  + // Retrieve the Swift.AnyObject type.
  CompilerType GetAnyObjectType();
  // Get a function type that returns nothing and take no parameters
  