Expand the instruction visitor to visit computations and values.

runtime/vm/flow_graph_builder.h

Index: runtime/vm/flow_graph_builder.h
diff --git a/runtime/vm/flow_graph_builder.h b/runtime/vm/flow_graph_builder.h
index a7148ae0029c70a935eb9a97638e27041e6aba38..b4cc5743ea1175a6479ef0eaa641c6769f0a45a6 100644
--- a/runtime/vm/flow_graph_builder.h
+++ b/runtime/vm/flow_graph_builder.h
@@ -143,7 +143,7 @@ class ValueGraphVisitor : public EffectGraphVisitor {
   // temporary value (i.e., set the output parameters).
   void ReturnValueOf(Computation* computation) {
     AddInstruction(new BindInstr(temp_index(), computation));
-    value_ = new TempValue(AllocateTempIndex());
+    value_ = new TempVal(AllocateTempIndex());
   }
 
   // Output parameters.
@@ -205,7 +205,7 @@ class TestGraphVisitor : public EffectGraphVisitor {
   // Helper to bind a computation and branch on its value.
   void BranchOnValueOf(Computation* computation) {
     AddInstruction(new BindInstr(temp_index(), computation));
-    BranchOnValue(new TempValue(temp_index()));
+    BranchOnValue(new TempVal(temp_index()));
   }
 
   // Output parameters.