Ensure slow properties for simple {__proto__:null} literals.

src/code-stub-assembler.cc

Index: src/code-stub-assembler.cc
diff --git a/src/code-stub-assembler.cc b/src/code-stub-assembler.cc
index dc97e704b75d557ebc1c88ccf77ab34e2ef73352..4a21b33688c7ed260a79f2e4920886ddd39cd196 100644
--- a/src/code-stub-assembler.cc
+++ b/src/code-stub-assembler.cc
@@ -4438,6 +4438,8 @@ Node* CodeStubAssembler::GetCapacity(Node* dictionary) {
   return LoadFixedArrayElement(dictionary, Dictionary::kCapacityIndex);
 }
 
+template Node* CodeStubAssembler::GetCapacity<NameDictionary>(Node* dictionary);
+
 template <class Dictionary>
 Node* CodeStubAssembler::GetNextEnumerationIndex(Node* dictionary) {
   return LoadFixedArrayElement(dictionary,