[turbofan] Remove extra attributes from SimplifiedOperatorBuilder methods.

src/compiler/simplified-operator-unittest.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/simplified-operator.h"
 
 #include "src/compiler/operator-properties-inl.h"
 #include "src/test/test-utils.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // -----------------------------------------------------------------------------
 // Pure operators.
 
 
 namespace {
 
 struct PureOperator {
-  const Operator* (SimplifiedOperatorBuilder::*constructor)() const;
+  const Operator* (SimplifiedOperatorBuilder::*constructor)();
   IrOpcode::Value opcode;
   Operator::Properties properties;
   int value_input_count;
 };
 
 
 std::ostream& operator<<(std::ostream& os, const PureOperator& pop) {
   return os << IrOpcode::Mnemonic(pop.opcode);
 }
 
@@ skipping 76 matching lines @@
   const Operator* op = (simplified.*pop.constructor)();
   EXPECT_EQ(pop.properties, op->properties() & pop.properties);
 }
 
 INSTANTIATE_TEST_CASE_P(SimplifiedOperatorTest, SimplifiedPureOperatorTest,
                         ::testing::ValuesIn(kPureOperators));
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8