[debugger] add lcov support to d8.

src/objects.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 6676 matching lines @@
   // Specifies whether to add offsets to position infos.
   enum OffsetFlag { NO_OFFSET = 0, WITH_OFFSET = 1 };
 
   // Retrieves information about the given position, optionally with an offset.
   // Returns false on failure, and otherwise writes into the given info object
   // on success.
   // The static method should is preferable for handlified callsites because it
   // initializes the line ends array, avoiding expensive recomputations.
   // The non-static version is not allocating and safe for unhandlified
   // callsites.
-  static bool GetPositionInfo(Handle<Script> script, int position,
-                              PositionInfo* info, OffsetFlag offset_flag);
+  V8_EXPORT_PRIVATE static bool GetPositionInfo(Handle<Script> script,
+                                                int position,
+                                                PositionInfo* info,
+                                                OffsetFlag offset_flag);
   bool GetPositionInfo(int position, PositionInfo* info,
                        OffsetFlag offset_flag) const;
 
   // Wrappers for GetPositionInfo
   static int GetColumnNumber(Handle<Script> script, int code_offset);
   int GetColumnNumber(int code_pos) const;
   static int GetLineNumber(Handle<Script> script, int code_offset);
   int GetLineNumber(int code_pos) const;
 
   // Get the JS object wrapping the given script; create it if none exists.
@@ skipping 4840 matching lines @@
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #include "src/objects/object-macros-undef.h"
 
 #endif  // V8_OBJECTS_H_