Add basic compilation support for modules

test/cctest/test-modules.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 "test/cctest/cctest.h"
+
+TEST(ModuleCompilation) {
+  v8::internal::FLAG_harmony_modules = true;
+  v8::Isolate* isolate = CcTest::isolate();
+  v8::HandleScope handle_scope(isolate);
+  LocalContext context;
+
+  CompileRun(
+      "var data = [];"
+      "function store(thing) {"
+      "  data.push(thing);"
+      "}");
+
+  CompileRunModule(
+      "export let a = 42;"
+      "store(a)");
+
+  CHECK_EQ(1, CompileRun("data.length")->Int32Value());
+  CHECK_EQ(42, CompileRun("data[0]")->Int32Value());
+}