[es7] implement |do| expressions proposal

src/full-codegen/full-codegen.cc

Index: src/full-codegen/full-codegen.cc
diff --git a/src/full-codegen/full-codegen.cc b/src/full-codegen/full-codegen.cc
index e6581b994fd2bdb71107d9d0e9c9907539959c20..9b90fb684470331a0a27e696b17e41c37fff2825 100644
--- a/src/full-codegen/full-codegen.cc
+++ b/src/full-codegen/full-codegen.cc
@@ -802,6 +802,15 @@ void FullCodeGenerator::VisitBlock(Block* stmt) {
 }
 
 
+void FullCodeGenerator::VisitDoExpression(DoExpression* expr) {
+  Comment cmnt(masm_, "[ Do Expression");
+  NestedStatement nested_block(this);
+  SetExpressionPosition(expr);
+  VisitBlock(expr->block());
+  EmitVariableLoad(expr->result());
+}
+
+
 void FullCodeGenerator::VisitExpressionStatement(ExpressionStatement* stmt) {
   Comment cmnt(masm_, "[ ExpressionStatement");
   SetStatementPosition(stmt);