Add internal compiler option to control defaulting of boot.art

Change-Id: I92a46cbd25cfc51c5c5d16fd8ae24c50195bf1d4
diff --git a/src/dex2oat.cc b/src/dex2oat.cc
index a4d7449..16b303e 100644
--- a/src/dex2oat.cc
+++ b/src/dex2oat.cc
@@ -145,6 +145,7 @@
   }
 
   Runtime::Options options;
+  options.push_back(std::make_pair("compiler", reinterpret_cast<void*>(NULL)));
   std::string boot_class_path_string;
   if (boot_image_option.empty()) {
     boot_class_path_string += "-Xbootclasspath:";