Make standalone D8 trace to single hydrogen.cfg file.

src/d8.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1529 matching lines @@
   if (threads.length() > 0 && options.use_preemption) {
     Locker lock(isolate);
     Locker::StopPreemption();
   }
 #endif  // V8_SHARED
   return 0;
 }
 
 
 #ifdef V8_SHARED
-static void EnableHarmonyTypedArraysViaCommandLine() {
-  int fake_argc = 2;
-  char **fake_argv = new char*[2];
+static void SetStandaloneFlagsViaCommandLine() {
+  int fake_argc = 3;
+  char **fake_argv = new char*[3];
   fake_argv[0] = NULL;
   fake_argv[1] = strdup("--harmony-typed-arrays");
+  fake_argv[2] = strdup("--trace-hydrogen-file=hydrogen.cfg");
   v8::V8::SetFlagsFromCommandLine(&fake_argc, fake_argv, false);
   free(fake_argv[1]);
   delete[] fake_argv;
 }
 #endif
 
 
 class ShellArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
  public:
   virtual void* Allocate(size_t length) { return malloc(length); }
   virtual void Free(void* data) { free(data); }
 };
 
 
 int Shell::Main(int argc, char* argv[]) {
   if (!SetOptions(argc, argv)) return 1;
   v8::V8::InitializeICU();
 #ifndef V8_SHARED
   i::FLAG_harmony_array_buffer = true;
   i::FLAG_harmony_typed_arrays = true;
+  i::FLAG_trace_hydrogen_file = "hydrogen.cfg";
 #else
-  EnableHarmonyTypedArraysViaCommandLine();
+  SetStandaloneFlagsViaCommandLine();
 #endif
   ShellArrayBufferAllocator array_buffer_allocator;
   v8::V8::SetArrayBufferAllocator(&array_buffer_allocator);
   int result = 0;
   Isolate* isolate = Isolate::GetCurrent();
   DumbLineEditor dumb_line_editor(isolate);
   {
     Initialize(isolate);
 #ifdef ENABLE_VTUNE_JIT_INTERFACE
     vTune::InitializeVtuneForV8();
@@ skipping 58 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif