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

runtime/vm/branch_optimizer.cc

Index: runtime/vm/branch_optimizer.cc
diff --git a/runtime/vm/branch_optimizer.cc b/runtime/vm/branch_optimizer.cc
index b6391d07ccdba965301165cdc6f4353e953da750..3693eda40191dfeae53141cd63b17a070defea2c 100644
--- a/runtime/vm/branch_optimizer.cc
+++ b/runtime/vm/branch_optimizer.cc
@@ -2,8 +2,6 @@
 // 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/branch_optimizer.h"
 
 #include "vm/flow_graph.h"
@@ -342,5 +340,3 @@ void IfConverter::Simplify(FlowGraph* flow_graph) {
 }
 
 }  // namespace dart
-
-#endif  // !defined(DART_PRECOMPILED_RUNTIME)