[turbofan] Remove usage of Unique<T> from graph.

src/compiler/common-operator.cc

Index: src/compiler/common-operator.cc
diff --git a/src/compiler/common-operator.cc b/src/compiler/common-operator.cc
index a809cc8aab249312710c202c80353e72138a88f0..28784562adfe1b95211b54d87530f5c7597a3e03 100644
--- a/src/compiler/common-operator.cc
+++ b/src/compiler/common-operator.cc
@@ -575,12 +575,14 @@ const Operator* CommonOperatorBuilder::NumberConstant(volatile double value) {
 
 
 const Operator* CommonOperatorBuilder::HeapConstant(
-    const Unique<HeapObject>& value) {
-  return new (zone()) Operator1<Unique<HeapObject>>(  // --
-      IrOpcode::kHeapConstant, Operator::kPure,       // opcode
-      "HeapConstant",                                 // name
-      0, 0, 0, 1, 0, 0,                               // counts
-      value);                                         // parameter
+    const Handle<HeapObject>& value) {
+  return new (zone())
+      Operator1<Handle<HeapObject>, Handle<HeapObject>::equal_to,
+                Handle<HeapObject>::hash>(           // --
+          IrOpcode::kHeapConstant, Operator::kPure,  // opcode
+          "HeapConstant",                            // name
+          0, 0, 0, 1, 0, 0,                          // counts
+          value);                                    // parameter
 }