[ESnext] Implement Object spread

src/interpreter/bytecode-generator.cc

Index: src/interpreter/bytecode-generator.cc
diff --git a/src/interpreter/bytecode-generator.cc b/src/interpreter/bytecode-generator.cc
index c35d77c907681f7e760233073b50a4e6df3d5b74..a999b9b157be2ce0c947eecf5036cffda36cb9c9 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -1624,6 +1624,7 @@ void BytecodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
     RegisterAllocationScope inner_register_scope(this);
     Literal* key = property->key()->AsLiteral();
     switch (property->kind()) {
+      case ObjectLiteral::Property::SPREAD:
       case ObjectLiteral::Property::CONSTANT:
         UNREACHABLE();
       case ObjectLiteral::Property::MATERIALIZED_LITERAL:
@@ -1767,6 +1768,13 @@ void BytecodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
         builder()->CallRuntime(function_id, args);
         break;
       }
+      case ObjectLiteral::Property::SPREAD: {
+        RegisterList args = register_allocator()->NewRegisterList(2);
+        builder()->MoveRegister(literal, args[0]);
+        VisitForRegisterValue(property->value(), args[1]);
+        builder()->CallRuntime(Runtime::kCopyDataProperties, args);
+        break;
+      }
       case ObjectLiteral::Property::PROTOTYPE:
         UNREACHABLE();  // Handled specially above.
         break;