Add simple VM test for precompiled code.

runtime/vm/isolate.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
@@ skipping 879 matching lines @@
   uword stack_allocated_local_address = reinterpret_cast<uword>(&func);
   return stack_allocated_local_address;
 #endif
 }
 
 
 void Isolate::SetupInstructionsSnapshotPage(
     const uint8_t* instructions_snapshot_buffer) {
   InstructionsSnapshot snapshot(instructions_snapshot_buffer);
 #if defined(DEBUG)
-  OS::Print("Precompiled instructions are at [0x%" Px ", 0x%" Px ")\n",
-            reinterpret_cast<uword>(snapshot.instructions_start()),
-            reinterpret_cast<uword>(snapshot.instructions_start()) +
-            snapshot.instructions_size());
+  if (FLAG_trace_isolates) {
+    OS::Print("Precompiled instructions are at [0x%" Px ", 0x%" Px ")\n",
+              reinterpret_cast<uword>(snapshot.instructions_start()),
+              reinterpret_cast<uword>(snapshot.instructions_start()) +
+              snapshot.instructions_size());
+  }
 #endif
   heap_->SetupInstructionsSnapshotPage(snapshot.instructions_start(),
                                        snapshot.instructions_size());
 }
 
 
 void Isolate::set_debugger_name(const char* name) {
   free(debugger_name_);
   debugger_name_ = strdup(name);
 }
@@ skipping 1580 matching lines @@
                            serialized_message_, serialized_message_len_);
 }
 
 
 void IsolateSpawnState::Cleanup() {
   SwitchIsolateScope switch_scope(I);
   Dart::ShutdownIsolate();
 }
 
 }  // namespace dart