Enable compiling mjsunit tests as ES6 modules

src/d8.h

 // Copyright 2012 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.
 
 #ifndef V8_D8_H_
 #define V8_D8_H_
 
 #ifndef V8_SHARED
 #include "src/allocation.h"
 #include "src/hashmap.h"
@@ skipping 230 matching lines @@
   const char* snapshot_blob;
 };
 
 #ifdef V8_SHARED
 class Shell {
 #else
 class Shell : public i::AllStatic {
 #endif  // V8_SHARED
 
  public:
-  static Local<UnboundScript> CompileString(
+  enum SourceType { SCRIPT, MODULE };
+
+  static Local<Script> CompileString(
       Isolate* isolate, Local<String> source, Local<Value> name,
-      v8::ScriptCompiler::CompileOptions compile_options);
-  static bool ExecuteString(Isolate* isolate,
-                            Handle<String> source,
-                            Handle<Value> name,
-                            bool print_result,
-                            bool report_exceptions);
+      v8::ScriptCompiler::CompileOptions compile_options,
+      SourceType source_type);
+  static bool ExecuteString(Isolate* isolate, Handle<String> source,
+                            Handle<Value> name, bool print_result,
+                            bool report_exceptions,
+                            SourceType source_type = SCRIPT);
   static const char* ToCString(const v8::String::Utf8Value& value);
   static void ReportException(Isolate* isolate, TryCatch* try_catch);
   static Handle<String> ReadFile(Isolate* isolate, const char* name);
   static Local<Context> CreateEvaluationContext(Isolate* isolate);
   static int RunMain(Isolate* isolate, int argc, char* argv[]);
   static int Main(int argc, char* argv[]);
   static void Exit(int exit_code);
   static void OnExit(Isolate* isolate);
 
 #ifndef V8_SHARED
@@ skipping 136 matching lines @@
   static void ExternalArrayWeakCallback(Isolate* isolate,
                                         Persistent<Object>* object,
                                         uint8_t* data);
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_D8_H_