Make precompiler work with product mode.

runtime/vm/flow_graph.cc

Index: runtime/vm/flow_graph.cc
diff --git a/runtime/vm/flow_graph.cc b/runtime/vm/flow_graph.cc
index 3296e096dc1f3ca90183123f0f6dc728e1e501c4..a5cadf04173fc9749c9b3e9e511986c453d7b3db 100644
--- a/runtime/vm/flow_graph.cc
+++ b/runtime/vm/flow_graph.cc
@@ -19,7 +19,6 @@ namespace dart {
 DEFINE_FLAG(bool, trace_smi_widening, false, "Trace Smi->Int32 widening pass.");
 #endif
 DEFINE_FLAG(bool, prune_dead_locals, true, "optimize dead locals away");
-DECLARE_FLAG(bool, reorder_basic_blocks);
 DECLARE_FLAG(bool, verify_compiler);
 
 
@@ -105,8 +104,9 @@ void FlowGraph::AddToDeferredPrefixes(
 
 bool FlowGraph::ShouldReorderBlocks(const Function& function,
                                     bool is_optimized) {
-  return is_optimized && FLAG_reorder_basic_blocks &&
-      FLAG_emit_edge_counters && !function.is_intrinsic();
+  return is_optimized
+      && FLAG_reorder_basic_blocks
+      && !function.is_intrinsic();
 }