[es7] implement |do| expressions proposal

src/typing-asm.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/typing-asm.h"
 
 #include "src/ast.h"
 #include "src/codegen.h"
@@ skipping 417 matching lines @@
   return_type_ = save_return_type;
   IntersectResult(expr, type);
 }
 
 
 void AsmTyper::VisitNativeFunctionLiteral(NativeFunctionLiteral* expr) {
   FAIL(expr, "function info literal encountered");
 }
 
 
+void AsmTyper::VisitDoExpression(DoExpression* expr) {
+  RECURSE(VisitStatements(expr->statements()));
+}
+
+
 void AsmTyper::VisitConditional(Conditional* expr) {
   RECURSE(VisitWithExpectation(expr->condition(), cache_.kInt32,
                                "condition expected to be integer"));
   RECURSE(VisitWithExpectation(
       expr->then_expression(), expected_type_,
       "conditional then branch type mismatch with enclosing expression"));
   Type* then_type = computed_type_;
   RECURSE(VisitWithExpectation(
       expr->else_expression(), expected_type_,
       "conditional else branch type mismatch with enclosing expression"));
@@ skipping 619 matching lines @@
     computed_type_->Print();
     PrintF("Expected type: ");
     expected_type_->Print();
 #endif
     FAIL(expr, msg);
   }
   expected_type_ = save;
 }
 }  // namespace internal
 }  // namespace v8