[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 95aceacaff3e4a9be8a85778ca7ea8616589988f..8d7b69690e8f45334d668a2c1527acd4fc9783b9 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -1635,6 +1635,7 @@ 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:
@@ -1783,6 +1784,13 @@ 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;