[upstreaming] Move Swift specific code in lldb-forward.h to own file

Author: Raphael Isemann

lldb/include/lldb/lldb-forward.h

@@ -190,9 +190,6 @@ class SectionList;
 class SectionLoadHistory;
 class SectionLoadList;
 class Settings;
-class SwiftASTContext;
-class SwiftLanguageRuntime;
-class SwiftREPL;
 class SourceManager;
 class SourceManagerImpl;
 class StackFrame;
@@ -411,7 +408,6 @@ typedef std::weak_ptr<lldb_private::Section> SectionWP;
 typedef std::shared_ptr<lldb_private::SectionLoadList> SectionLoadListSP;
 typedef std::shared_ptr<lldb_private::SearchFilter> SearchFilterSP;
 typedef std::shared_ptr<lldb_private::Settings> SettingsSP;
-typedef std::shared_ptr<lldb_private::SwiftASTContext> SwiftASTContextSP;
 typedef std::unique_ptr<lldb_private::SourceManager> SourceManagerUP;
 typedef std::shared_ptr<lldb_private::StackFrame> StackFrameSP;
 typedef std::unique_ptr<lldb_private::StackFrame> StackFrameUP;
@@ -489,5 +485,7 @@ class StringRef;
 
 } // namespace llvm
 
+#include "swift-lldb-forward.h"
+
 #endif // #if defined(__cplusplus)
 #endif // LLDB_lldb_forward_h_

lldb/include/lldb/swift-lldb-forward.h

@@ -0,0 +1,36 @@
+//===-- swift-lldb-forward.h ------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_swift_lldb_forward_h_
+#define LLDB_swift_lldb_forward_h_
+
+#include "lldb-forward.h"
+
+#if defined(__cplusplus)
+
+#include "lldb/Utility/SharingPtr.h"
+
+// lldb forward declarations
+namespace lldb_private {
+class SwiftASTContext;
+class SwiftLanguageRuntime;
+class SwiftREPL;
+} // namespace lldb_private
+
+// lldb forward declarations
+namespace lldb {
+typedef std::shared_ptr<lldb_private::SwiftASTContext> SwiftASTContextSP;
+} // namespace lldb
+
+// llvm forward declarations
+namespace llvm {
+
+} // namespace llvm
+
+#endif // #if defined(__cplusplus)
+#endif // LLDB_swift_lldb_forward_h_