Compile fix for older GCCs.

src/hydrogen-instructions.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2723 matching lines @@
     boolean_value_(double_value != 0 && !std::isnan(double_value)),
     int32_value_(DoubleToInt32(double_value)),
     double_value_(double_value) {
   has_smi_value_ = has_int32_value_ && Smi::IsValid(int32_value_);
   set_type(has_smi_value_ ? HType::Smi() : HType::TaggedNumber());
   Initialize(r);
 }
 
 
 HConstant::HConstant(ExternalReference reference)
-  : HTemplateInstruction(HType::None()),
+  : HTemplateInstruction<0>(HType::None()),
     has_smi_value_(false),
     has_int32_value_(false),
     has_double_value_(false),
     has_external_reference_value_(true),
     is_internalized_string_(false),
     is_not_in_new_space_(true),
     is_cell_(false),
     boolean_value_(true),
     external_reference_value_(reference) {
   Initialize(Representation::External());
@@ skipping 1745 matching lines @@
       break;
     case kExternalMemory:
       stream->Add("[external-memory]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal