Reapply "Eliminate dependencies on assemblers and code stubs in precompiled runtime."

runtime/vm/flow_graph_allocator.cc

Index: runtime/vm/flow_graph_allocator.cc
diff --git a/runtime/vm/flow_graph_allocator.cc b/runtime/vm/flow_graph_allocator.cc
index e70a5b781eec4f1a248a02ceca48921dbac1fdbe..8a3030cfdc6ff025282866073d2630c8318fa41d 100644
--- a/runtime/vm/flow_graph_allocator.cc
+++ b/runtime/vm/flow_graph_allocator.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_allocator.h"
 
 #include "vm/bit_vector.h"
@@ -3016,3 +3018,5 @@ void FlowGraphAllocator::AllocateRegisters() {
 }
 
 }  // namespace dart
+
+#endif  // !defined(DART_PRECOMPILED_RUNTIME)