[turbofan] Minor cleanup to reduce code duplication.

test/unittests/compiler/js-typed-lowering-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/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node-properties-inl.h"
@@ skipping 32 matching lines @@
   ~JSTypedLoweringTest() OVERRIDE {}
 
  protected:
   Reduction Reduce(Node* node) {
     MachineOperatorBuilder machine(zone());
     JSGraph jsgraph(graph(), common(), javascript(), &machine);
     JSTypedLowering reducer(&jsgraph, zone());
     return reducer.Reduce(node);
   }
 
-  Node* Parameter(Type* type, int index = 0) {
-    Node* node = graph()->NewNode(common()->Parameter(index), graph()->start());
-    NodeProperties::SetBounds(node, Bounds(Type::None(), type));
-    return node;
-  }
-
   Handle<JSArrayBuffer> NewArrayBuffer(void* bytes, size_t byte_length) {
     Handle<JSArrayBuffer> buffer = factory()->NewJSArrayBuffer();
     Runtime::SetupArrayBuffer(isolate(), buffer, true, bytes, byte_length);
     return buffer;
   }
 
   Matcher<Node*> IsIntPtrConstant(intptr_t value) {
     return sizeof(value) == 4 ? IsInt32Constant(static_cast<int32_t>(value))
                               : IsInt64Constant(static_cast<int64_t>(value));
   }
@@ skipping 563 matching lines @@
           IsStoreElement(
               access, IsIntPtrConstant(bit_cast<intptr_t>(&backing_store[0])),
               key, value, effect, control));
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8