Fix out-of-bounds read in SourcePositionToScriptPosition with --hydrogen-track-positions.

src/hydrogen.h

 // Copyright 2012 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_HYDROGEN_H_
 #define V8_HYDROGEN_H_
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 506 matching lines @@
     }
 
     Handle<SharedFunctionInfo> shared() const { return shared_; }
     int start_position() const { return start_position_; }
 
    private:
     Handle<SharedFunctionInfo> shared_;
     int start_position_;
   };
 
-  int next_inline_id_;
   ZoneList<InlinedFunctionInfo> inlined_functions_;
+  ZoneList<int> inlining_id_to_function_id_;
 
   DISALLOW_COPY_AND_ASSIGN(HGraph);
 };
 
 
 Zone* HBasicBlock::zone() const { return graph_->zone(); }
 
 
 // Type of stack frame an environment might refer to.
 enum FrameType {
@@ skipping 2366 matching lines @@
   }
 
  private:
   HGraphBuilder* builder_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_