[es7] implement |do| expressions proposal

src/compiler/ast-loop-assignment-analyzer.cc

 // Copyright 2014 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/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler.h"
 #include "src/parser.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 59 matching lines @@
 void ALAA::VisitSuperPropertyReference(SuperPropertyReference* leaf) {}
 void ALAA::VisitSuperCallReference(SuperCallReference* leaf) {}
 
 
 // ---------------------------------------------------------------------------
 // -- Pass-through nodes------------------------------------------------------
 // ---------------------------------------------------------------------------
 void ALAA::VisitBlock(Block* stmt) { VisitStatements(stmt->statements()); }
 
 
+void ALAA::VisitDoExpression(DoExpression* expr) {
+  Visit(expr->block());
+  Visit(expr->result());
+}
+
+
 void ALAA::VisitExpressionStatement(ExpressionStatement* stmt) {
   Visit(stmt->expression());
 }
 
 
 void ALAA::VisitIfStatement(IfStatement* stmt) {
   Visit(stmt->condition());
   Visit(stmt->then_statement());
   Visit(stmt->else_statement());
 }
@@ skipping 208 matching lines @@
   int count = 0;
   int var_index = AstLoopAssignmentAnalyzer::GetVariableIndex(scope, var);
   for (size_t i = 0; i < list_.size(); i++) {
     if (list_[i].second->Contains(var_index)) count++;
   }
   return count;
 }
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8