[debugger] fix break locations for assignments and return.

src/full-codegen/full-codegen.cc

 // 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.
 
 #include "src/full-codegen/full-codegen.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/ast-numbering.h"
 #include "src/ast/prettyprinter.h"
 #include "src/ast/scopeinfo.h"
@@ skipping 833 matching lines @@
   } else {
     // This expression cannot throw a reference error at the top level.
     VisitInDuplicateContext(expr);
   }
 }
 
 
 void FullCodeGenerator::VisitBlock(Block* stmt) {
   Comment cmnt(masm_, "[ Block");
   NestedBlock nested_block(this, stmt);
-  SetStatementPosition(stmt);
 
   {
     EnterBlockScopeIfNeeded block_scope_state(
         this, stmt->scope(), stmt->EntryId(), stmt->DeclsId(), stmt->ExitId());
     VisitStatements(stmt->statements());
     __ bind(nested_block.break_label());
   }
 }
 
 
@@ skipping 1054 matching lines @@
   return var->mode() == CONST_LEGACY || var->scope()->is_nonlinear() ||
          var->initializer_position() >= proxy->position();
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8