[es7] implement |do| expressions proposal

src/typing-asm.cc

Index: src/typing-asm.cc
diff --git a/src/typing-asm.cc b/src/typing-asm.cc
index 501af026dcba8b636aed0c653a9eae3a2efc7cd9..495097a2e76fc50e80872b94761e24f85e5822e8 100644
--- a/src/typing-asm.cc
+++ b/src/typing-asm.cc
@@ -435,6 +435,11 @@ void AsmTyper::VisitNativeFunctionLiteral(NativeFunctionLiteral* expr) {
 }
 
 
+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"));