[turbofan] Add Receiver feedback for abstract/strict equality.

src/type-hints.cc

Index: src/type-hints.cc
diff --git a/src/type-hints.cc b/src/type-hints.cc
index 4267ab890696e00e7f00114e063c2b876fdb0d9b..1ea7cbbb80f2dbc488d2b31d2bea5f27f926ff81 100644
--- a/src/type-hints.cc
+++ b/src/type-hints.cc
@@ -40,6 +40,8 @@ std::ostream& operator<<(std::ostream& os, CompareOperationHint hint) {
       return os << "InternalizedString";
     case CompareOperationHint::kString:
       return os << "String";
+    case CompareOperationHint::kReceiver:
+      return os << "Receiver";
     case CompareOperationHint::kAny:
       return os << "Any";
   }