Reland "Add DoubleTestOp instruction"

runtime/vm/intermediate_language.cc

 // 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.
 
 #include "vm/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/bootstrap.h"
 #include "vm/compiler.h"
 #include "vm/constant_propagator.h"
@@ skipping 1479 matching lines @@
                            new Value(left()->definition()),
                            DeoptimizationTarget());
     flow_graph->InsertBefore(this, math_unary, env(), FlowGraph::kValue);
     return math_unary;
   }
 
   return this;
 }
 
 
+Definition* DoubleTestOpInstr::Canonicalize(FlowGraph* flow_graph) {
+  return HasUses() ? this : NULL;
+}
+
+
 static bool IsCommutative(Token::Kind op) {
   switch (op) {
     case Token::kMUL:
     case Token::kADD:
     case Token::kBIT_AND:
     case Token::kBIT_OR:
     case Token::kBIT_XOR:
       return true;
     default:
       return false;
@@ skipping 2351 matching lines @@
   set_native_c_function(native_function);
   function().SetIsNativeAutoSetupScope(auto_setup_scope);
   Dart_NativeEntryResolver resolver = library.native_entry_resolver();
   bool is_bootstrap_native = Bootstrap::IsBootstapResolver(resolver);
   set_is_bootstrap_native(is_bootstrap_native);
 }
 
 #undef __
 
 }  // namespace dart