AST printer: print declarations from a module in alphabetical order

Also, move module interface printing to libAST to make it reuseable.


Swift SVN r10932

include/swift/AST/ModuleInterfacePrinting.h

@@ -0,0 +1,28 @@
+//===--- ModuleInterfacePrinting.h - Routines to print module interface ---===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SWIFT_AST_MODULE_INTERFACE_PRINTING_H
+#define SWIFT_AST_MODULE_INTERFACE_PRINTING_H
+
+#include "swift/Basic/LLVM.h"
+
+namespace swift {
+class Module;
+struct PrintOptions;
+
+void printModuleInterface(Module *M, raw_ostream &OS,
+                          const PrintOptions &Options);
+
+} // namespace swift
+
+#endif // SWIFT_AST_MODULE_INTERFACE_PRINTING_H
+