[turbofan] Minor cleanup to reduce code duplication.

test/unittests/compiler/graph-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 "test/unittests/compiler/graph-unittest.h"
 
-#include <ostream>  // NOLINT(readability/streams)
-
 #include "src/compiler/node-properties-inl.h"
 #include "test/unittests/compiler/node-test-utils.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 GraphTest::GraphTest(int num_parameters) : common_(zone()), graph_(zone()) {
   graph()->SetStart(graph()->NewNode(common()->Start(num_parameters)));
 }
@@ skipping 67 matching lines @@
   return IsHeapConstant(
       Unique<HeapObject>::CreateImmovable(factory()->false_value()));
 }
 
 
 Matcher<Node*> GraphTest::IsTrueConstant() {
   return IsHeapConstant(
       Unique<HeapObject>::CreateImmovable(factory()->true_value()));
 }
 
+
+TypedGraphTest::TypedGraphTest(int num_parameters)
+    : GraphTest(num_parameters), typer_(graph(), MaybeHandle<Context>()) {}
+
+
+TypedGraphTest::~TypedGraphTest() {}
+
+
+Node* TypedGraphTest::Parameter(Type* type, int32_t index) {
+  Node* node = GraphTest::Parameter(index);
+  NodeProperties::SetBounds(node, Bounds(type));
+  return node;
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8