Eliminate dependencies on assemblers and code stubs in precompiled runtime.

runtime/vm/flow_graph_builder.cc

Index: runtime/vm/flow_graph_builder.cc
diff --git a/runtime/vm/flow_graph_builder.cc b/runtime/vm/flow_graph_builder.cc
index a5e893434f1a8346586fc86c926ebd3734aba76f..1c2a12575e159cbe2c89ff5a0a9c654c3339cf2e 100644
--- a/runtime/vm/flow_graph_builder.cc
+++ b/runtime/vm/flow_graph_builder.cc
@@ -2,6 +2,8 @@
 // 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.
 
+#if !defined(DART_PRECOMPILED_RUNTIME)
+
 #include "vm/flow_graph_builder.h"
 
 #include "lib/invocation_mirror.h"
@@ -4582,3 +4584,5 @@ bool FlowGraphBuilder::SimpleInstanceOfType(const AbstractType& type) {
 }
 
 }  // namespace dart
+
+#endif  // !defined(DART_PRECOMPILED_RUNTIME)