[Interpreter] Add function literal support.

test/cctest/interpreter/test-interpreter.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/execution.h"
 #include "src/handles.h"
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/interpreter.h"
@@ skipping 1535 matching lines @@
       .CallRuntime(Runtime::kAdd, Register(0), 2)
       .Return();
   Handle<BytecodeArray> bytecode_array = builder.ToBytecodeArray();
 
   InterpreterTester tester(handles.main_isolate(), bytecode_array);
   auto callable = tester.GetCallable<>();
 
   Handle<Object> return_val = callable().ToHandleChecked();
   CHECK_EQ(Smi::cast(*return_val), Smi::FromInt(55));
 }
+
+
+TEST(InterpreterFunctionLiteral) {
+  HandleAndZoneScope handles;
+
+  // Test calling a function literal.
+  std::string source(
+      "function " + InterpreterTester::function_name() + "(a) {\n"
+      "  return (function(x){ return x + 2; })(a);\n"
+      "}");
+  InterpreterTester tester(handles.main_isolate(), source.c_str());
+  auto callable = tester.GetCallable<Handle<Object>>();
+
+  Handle<i::Object> return_val = callable(
+      Handle<Smi>(Smi::FromInt(3), handles.main_isolate())).ToHandleChecked();
+  CHECK_EQ(Smi::cast(*return_val), Smi::FromInt(5));
+}