runtime: expose the layout of SwiftError to LLDB through global constants

stdlib/public/runtime/ErrorObjectConstants.cpp

@@ -0,0 +1,24 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2016 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "ErrorObject.h"
+
+using namespace swift;
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Winvalid-offsetof"
+const size_t swift::_swift_lldb_offsetof_SwiftError_typeMetadata =
+    offsetof(SwiftError, type);
+#pragma clang diagnostic pop
+
+const size_t swift::_swift_lldb_sizeof_SwiftError = sizeof(SwiftError);
+