[turbofan ] Simplify reference equal if both inputs are constants

src/compiler/simplified-operator-reducer.cc

Index: src/compiler/simplified-operator-reducer.cc
diff --git a/src/compiler/simplified-operator-reducer.cc b/src/compiler/simplified-operator-reducer.cc
index acd0f66ef65bf69b463853d398a7621bedf30227..120d7926d541bbc5feab7f5627d5aa8c1dbc7540 100644
--- a/src/compiler/simplified-operator-reducer.cc
+++ b/src/compiler/simplified-operator-reducer.cc
@@ -89,6 +89,8 @@ Reduction SimplifiedOperatorReducer::Reduce(Node* node) {
       if (m.HasValue()) return ReplaceNumber(FastUI2D(m.Value()));
       break;
     }
+    case IrOpcode::kReferenceEqual:
+      return ReduceReferenceEqual(node);
     default:
       break;
   }
@@ -96,6 +98,23 @@ Reduction SimplifiedOperatorReducer::Reduce(Node* node) {
 }
 
 
+Reduction SimplifiedOperatorReducer::ReduceReferenceEqual(Node* node) {
+  DCHECK_EQ(IrOpcode::kReferenceEqual, node->opcode());
+  Node* const left = NodeProperties::GetValueInput(node, 0);
+  Node* const right = NodeProperties::GetValueInput(node, 1);
+  HeapObjectMatcher match_left(left);
+  HeapObjectMatcher match_right(right);
+  if (match_left.HasValue() && match_right.HasValue()) {
+    if (match_left.Value().is_identical_to(match_right.Value())) {
+      return Replace(jsgraph()->TrueConstant());
+    } else {
+      return Replace(jsgraph()->FalseConstant());
+    }
+  }
+  return NoChange();
+}
+
+
 Reduction SimplifiedOperatorReducer::Change(Node* node, const Operator* op,
                                             Node* a) {
   DCHECK_EQ(node->InputCount(), OperatorProperties::GetTotalInputCount(op));