[proxies] Better print for proxies in d8

src/js/collection.js

Index: src/js/collection.js
diff --git a/src/js/collection.js b/src/js/collection.js
index 10d8a385e52b5643972dad0252a9fcc0b855c907..0d7195d53e26757a68b5bdb3dcba34bea38857c2 100644
--- a/src/js/collection.js
+++ b/src/js/collection.js
@@ -100,7 +100,7 @@ function GetExistingHash(key) {
     if ((field & 1 /* Name::kHashNotComputedMask */) === 0) {
       return field >>> 2 /* Name::kHashShift */;
     }
-  } else if (IS_RECEIVER(key) && !%_IsJSProxy(key) && !IS_GLOBAL(key)) {
+  } else if (IS_RECEIVER(key) && !IS_PROXY(key) && !IS_GLOBAL(key)) {
     var hash = GET_PRIVATE(key, hashCodeSymbol);
     return hash;
   }