[ic] Load IC data handlers now support prototype chain checks with global and dictionary objects.

src/ic/mips64/handler-compiler-mips64.cc

Index: src/ic/mips64/handler-compiler-mips64.cc
diff --git a/src/ic/mips64/handler-compiler-mips64.cc b/src/ic/mips64/handler-compiler-mips64.cc
index 282d5ac320759cd71d50dd560059b0f299357ed1..a69e0f8663434740ec253905ee9dd8c94fec8af5 100644
--- a/src/ic/mips64/handler-compiler-mips64.cc
+++ b/src/ic/mips64/handler-compiler-mips64.cc
@@ -464,10 +464,7 @@ Register PropertyHandlerCompiler::CheckPrototypes(
                                 name, scratch2, miss);
     } else if (current_map->is_dictionary_map()) {
       DCHECK(!current_map->IsJSGlobalProxyMap());  // Proxy maps are fast.
-      if (!name->IsUniqueName()) {
-        DCHECK(name->IsString());
-        name = factory()->InternalizeString(Handle<String>::cast(name));
-      }
+      DCHECK(name->IsUniqueName());
       DCHECK(current.is_null() ||
              current->property_dictionary()->FindEntry(name) ==
                  NameDictionary::kNotFound);