Eliminate dependencies on assemblers and code stubs in precompiled runtime.

runtime/vm/object_service.cc

Index: runtime/vm/object_service.cc
diff --git a/runtime/vm/object_service.cc b/runtime/vm/object_service.cc
index ca83ef1a870fc7095d73b6e202df177071a8893f..cad7f9ea7430931afaef3fbaa876e04f727ca7fe 100644
--- a/runtime/vm/object_service.cc
+++ b/runtime/vm/object_service.cc
@@ -868,11 +868,13 @@ void Code::PrintJSONImpl(JSONStream* stream, bool ref) const {
   jsobj.AddProperty("_objectPool", object_pool);
   {
     JSONArray jsarr(&jsobj, "_disassembly");
+#if !defined(DART_PRECOMPILED_RUNTIME)
     if (is_alive()) {
       // Only disassemble alive code objects.
       DisassembleToJSONStream formatter(jsarr);
       Disassemble(&formatter);
     }
+#endif  // !defined(DART_PRECOMPILED_RUNTIME)
   }
   const PcDescriptors& descriptors = PcDescriptors::Handle(pc_descriptors());
   if (!descriptors.IsNull()) {