Refactored FlowGraphBuilder into a separate FlowGraph representation.

runtime/vm/flow_graph_compiler_arm.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_COMPILER_ARM_H_
 #define VM_FLOW_GRAPH_COMPILER_ARM_H_
 
 #ifndef VM_FLOW_GRAPH_COMPILER_H_
 #error Include flow_graph_compiler.h instead of flow_graph_compiler_arm.h.
 #endif
 
+#include "vm/flow_graph.h"
 #include "vm/intermediate_language.h"
 
 namespace dart {
 
 class Assembler;
 class Code;
 template <typename T> class GrowableArray;
 class ParsedFunction;
 
 // Stubbed out implementation of graph compiler, bails out immediately if
 // CompileGraph is called. The rest of the public API is UNIMPLEMENTED.
 class FlowGraphCompiler : public FlowGraphVisitor {
  public:
   FlowGraphCompiler(Assembler* assembler,
-                    const ParsedFunction& parsed_function,
-                    const GrowableArray<BlockEntryInstr*>& blocks,
+                    const FlowGraph& flow_graph,
                     bool is_optimizing)
-      : FlowGraphVisitor(blocks),
-        parsed_function_(parsed_function),
+      : FlowGraphVisitor(flow_graph.reverse_postorder()),
+        parsed_function_(flow_graph.parsed_function()),
         is_optimizing_(is_optimizing) {
   }
 
   virtual ~FlowGraphCompiler() { }
 
   static bool CanOptimize();
 
   void CompileGraph();
 
   void FinalizePcDescriptors(const Code& code);
   void FinalizeStackmaps(const Code& code);
   void FinalizeVarDescriptors(const Code& code);
   void FinalizeExceptionHandlers(const Code& code);
   void FinalizeComments(const Code& code);
 
  private:
   // Bail out of the flow graph compiler.  Does not return to the caller.
   void Bailout(const char* reason);
 
   const ParsedFunction& parsed_function_;
   const bool is_optimizing_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphCompiler);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_COMPILER_ARM_H_