Turn more explicitly named temps into uses of definitions.

runtime/vm/flow_graph_builder.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_BUILDER_H_
 #define VM_FLOW_GRAPH_BUILDER_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 233 matching lines @@
   Value* value_;
 
  private:
   // Helper to set the output state to return a Value.
   virtual void ReturnValue(Value* value) { value_ = value; }
 
   // Specify a computation as the final result.  Adds a Bind instruction to
   // the graph and returns its temporary value (i.e., set the output
   // parameters).
   virtual void ReturnComputation(Computation* computation) {
-    AddInstruction(new BindInstr(temp_index(), computation));
-    value_ = new TempVal(AllocateTempIndex());
+    BindInstr* defn = new BindInstr(temp_index(), computation);
+    AddInstruction(defn);
+    AllocateTempIndex();
+    value_ = new UseVal(defn);
   }
 
   virtual void CompiletimeStringInterpolation(const Function& interpol_func,
                                               const Array& literals);
 
   virtual void BuildInstanceOf(ComparisonNode* node);
 };
 
 
 // Translate an AstNode to a control-flow graph fragment for both its effects
@@ skipping 59 matching lines @@
   intptr_t condition_token_index() const { return condition_token_index_; }
 
  private:
   // Construct and concatenate a Branch instruction to this graph fragment.
   // Closes the fragment and sets the output parameters.
   virtual void ReturnValue(Value* value);
 
   // Specify a computation as the final result.  Adds a Bind instruction to
   // the graph and branches on its value.
   virtual void ReturnComputation(Computation* computation) {
-    AddInstruction(new BindInstr(temp_index(), computation));
-    ReturnValue(new TempVal(temp_index()));
+    BindInstr* defn = new BindInstr(temp_index(), computation);
+    AddInstruction(defn);
+    ReturnValue(new UseVal(defn));
   }
 
   // Output parameters.
   TargetEntryInstr** true_successor_address_;
   TargetEntryInstr** false_successor_address_;
 
   intptr_t condition_node_id_;
   intptr_t condition_token_index_;
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_BUILDER_H_