Eliminate dependencies on assemblers and code stubs in precompiled runtime.

runtime/vm/flow_graph_type_propagator.cc

Index: runtime/vm/flow_graph_type_propagator.cc
diff --git a/runtime/vm/flow_graph_type_propagator.cc b/runtime/vm/flow_graph_type_propagator.cc
index 88465a602635906b6b22041b36eba728d6c23744..38d4af8a17cd65793f0158362816c099a7ff473b 100644
--- a/runtime/vm/flow_graph_type_propagator.cc
+++ b/runtime/vm/flow_graph_type_propagator.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_type_propagator.h"
 
 #include "vm/cha.h"
@@ -1536,3 +1538,5 @@ CompileType ExtractNthOutputInstr::ComputeType() const {
 }
 
 }  // namespace dart
+
+#endif  // !defined(DART_PRECOMPILED_RUNTIME)