VM: Move redundancy elimination phases into a separate file.

runtime/vm/flow_graph.h

 // Copyright (c) 2013, 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_H_
 #define VM_FLOW_GRAPH_H_
 
 #include "vm/bit_vector.h"
 #include "vm/growable_array.h"
 #include "vm/hash_map.h"
@@ skipping 126 matching lines @@
   GrowableArray<BlockEntryInstr*>* CodegenBlockOrder(bool is_optimized);
 
   // Iterators.
   BlockIterator reverse_postorder_iterator() const {
     return BlockIterator(reverse_postorder());
   }
   BlockIterator postorder_iterator() const {
     return BlockIterator(postorder());
   }
 
+  void EnsureSSATempIndex(Definition* defn, Definition* replacement);
+
+  void ReplaceCurrentInstruction(ForwardInstructionIterator* iterator,
+                                 Instruction* current,
+                                 Instruction* replacement);
+
   intptr_t current_ssa_temp_index() const { return current_ssa_temp_index_; }
   void set_current_ssa_temp_index(intptr_t index) {
     current_ssa_temp_index_ = index;
   }
 
   intptr_t max_virtual_register_number() const {
     return current_ssa_temp_index();
   }
 
   Thread* thread() const { return thread_; }
@@ skipping 364 matching lines @@
 
  private:
   GrowableArray<Definition*> defs_;
   BitVector* contains_vector_;
 };
 
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_H_