[turbofan] Minor cleanup to reduce code duplication.

test/unittests/compiler/graph-unittest.cc

Index: test/unittests/compiler/graph-unittest.cc
diff --git a/test/unittests/compiler/graph-unittest.cc b/test/unittests/compiler/graph-unittest.cc
index 2cfd23a125d0d2e1795f84f996d1d9b0ef50086c..95432587a825f947f42616c8067c86bff7a03f17 100644
--- a/test/unittests/compiler/graph-unittest.cc
+++ b/test/unittests/compiler/graph-unittest.cc
@@ -4,8 +4,6 @@
 
 #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"
 
@@ -93,6 +91,20 @@ Matcher<Node*> GraphTest::IsTrueConstant() {
       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