Fix the debugger in multipass mode by introducing phantome...

src/cfg.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 418 matching lines @@
   if (builder.cfg() == NULL) {
     BAILOUT("unsupported expression in expression statement");
   }
   // Here's a temporary hack: we bang on the last instruction of the
   // expression (if any) to set its location to Effect.
   if (!builder.cfg()->is_empty()) {
     InstructionBlock* block = InstructionBlock::cast(builder.cfg()->exit());
     Instruction* instr = block->instructions()->last();
     instr->set_location(CfgGlobals::current()->effect_location());
   }
+  cfg_->Append(new PositionInstr(stmt->statement_pos()));
   cfg_->Concatenate(builder.cfg());
 }
 
 
 void StatementBuilder::VisitEmptyStatement(EmptyStatement* stmt) {
   // Nothing to do.
 }
 
 
 void StatementBuilder::VisitIfStatement(IfStatement* stmt) {
@@ skipping 11 matching lines @@
 }
 
 
 void StatementBuilder::VisitReturnStatement(ReturnStatement* stmt) {
   ExpressionBuilder builder;
   builder.Build(stmt->expression());
   if (builder.cfg() == NULL) {
     BAILOUT("unsupported expression in return statement");
   }
 
+  cfg_->Append(new PositionInstr(stmt->statement_pos()));
   cfg_->Concatenate(builder.cfg());
   cfg_->AppendReturnInstruction(builder.value());
 }
 
 
 void StatementBuilder::VisitWithEnterStatement(WithEnterStatement* stmt) {
   BAILOUT("WithEnterStatement");
 }
 
 
@@ skipping 115 matching lines @@
 void ExitNode::Print() {
   if (!is_marked_) {
     is_marked_ = true;
     PrintF("L%d:\nExit\n\n", number());
   }
 }
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal