[turbofan] Introduce proper ObjectIsReceiver operator.

src/compiler/js-native-context-specialization.cc

Index: src/compiler/js-native-context-specialization.cc
diff --git a/src/compiler/js-native-context-specialization.cc b/src/compiler/js-native-context-specialization.cc
index 06cf770f332631333e3c1ec39b443d565caa376f..35e657f442cb08ddb3feb33493cf608c67ab8768 100644
--- a/src/compiler/js-native-context-specialization.cc
+++ b/src/compiler/js-native-context-specialization.cc
@@ -705,7 +705,7 @@ Reduction JSNativeContextSpecialization::ReduceElementAccess(
     Type* element_type = Type::Any();
     MachineType element_machine_type = MachineType::AnyTagged();
     if (IsFastDoubleElementsKind(elements_kind)) {
-      element_type = type_cache_.kFloat64;
+      element_type = Type::Number();
       element_machine_type = MachineType::Float64();
     } else if (IsFastSmiElementsKind(elements_kind)) {
       element_type = type_cache_.kSmi;