[turbofan] Optimize strict equality of unique values.

src/compiler/js-typed-lowering.cc

Index: src/compiler/js-typed-lowering.cc
diff --git a/src/compiler/js-typed-lowering.cc b/src/compiler/js-typed-lowering.cc
index 168fb48cc093949777bf31d37e16f2cb2fed937e..8715fba4cde7fb5c9e8ab9d562a04c38154e2940 100644
--- a/src/compiler/js-typed-lowering.cc
+++ b/src/compiler/js-typed-lowering.cc
@@ -566,6 +566,10 @@ Reduction JSTypedLowering::ReduceJSStrictEqual(Node* node, bool invert) {
     return r.ChangeToPureOperator(
         simplified()->ReferenceEqual(Type::Receiver()), invert);
   }
+  if (r.BothInputsAre(Type::Unique())) {
+    return r.ChangeToPureOperator(simplified()->ReferenceEqual(Type::Unique()),
+                                  invert);
+  }
   if (r.BothInputsAre(Type::String())) {
     return r.ChangeToPureOperator(simplified()->StringEqual(), invert);
   }