VM: In CompileAll, don't iterate collected closures for every class

runtime/vm/flow_graph_optimizer.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 #ifndef VM_FLOW_GRAPH_OPTIMIZER_H_
 #define VM_FLOW_GRAPH_OPTIMIZER_H_
 
 #include "vm/intermediate_language.h"
 #include "vm/flow_graph.h"
 
 namespace dart {
 
 class CSEInstructionMap;
 template <typename T> class GrowableArray;
 class ParsedFunction;
 
 class FlowGraphOptimizer : public FlowGraphVisitor {
  public:
-  explicit FlowGraphOptimizer(
+  FlowGraphOptimizer(
       FlowGraph* flow_graph,
       bool use_speculative_inlining,
       GrowableArray<intptr_t>* inlining_black_list)
       : FlowGraphVisitor(flow_graph->reverse_postorder()),
         flow_graph_(flow_graph),
         use_speculative_inlining_(use_speculative_inlining),
         inlining_black_list_(inlining_black_list) {
     ASSERT(!use_speculative_inlining || (inlining_black_list != NULL));
   }
   virtual ~FlowGraphOptimizer() {}
@@ skipping 417 matching lines @@
 // Optimize spill stores inside try-blocks by identifying values that always
 // contain a single known constant at catch block entry.
 class TryCatchAnalyzer : public AllStatic {
  public:
   static void Optimize(FlowGraph* flow_graph);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_OPTIMIZER_H_