Refactor the code for making inlining decisions.

runtime/vm/flow_graph.h

Index: runtime/vm/flow_graph.h
diff --git a/runtime/vm/flow_graph.h b/runtime/vm/flow_graph.h
index 13d9cbab344023da07ae82ddf81400d7170854aa..be13c25df4c41ef801ca8ee25bb809857063cc47 100644
--- a/runtime/vm/flow_graph.h
+++ b/runtime/vm/flow_graph.h
@@ -123,7 +123,7 @@ class FlowGraph : public ZoneAllocated {
 
   // Operations on the flow graph.
   void ComputeSSA(intptr_t next_virtual_register_number,
-                  GrowableArray<Definition*>* inlining_parameters);
+                  ZoneGrowableArray<Definition*>* inlining_parameters);
 
   // Finds natural loops in the flow graph and attaches a list of loop
   // body blocks for each loop header.
@@ -154,7 +154,7 @@ class FlowGraph : public ZoneAllocated {
       GrowableArray<intptr_t>* label);
 
   void Rename(GrowableArray<PhiInstr*>* live_phis,
-              GrowableArray<Definition*>* inlining_parameters);
+              ZoneGrowableArray<Definition*>* inlining_parameters);
   void RenameRecursive(
       BlockEntryInstr* block_entry,
       GrowableArray<Definition*>* env,