[Interpreter] Avoid dereferencing handles in ConstantPoolArrayBuilder.

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 23922 matching lines @@
     CHECK_EQ(13, result->Int32Value(env.local()).FromJust());
     CheckMagicComments(script.ToLocalChecked(), expected_source_url,
                        expected_source_mapping_url);
   } else {
     CHECK(script.IsEmpty());
     CHECK(try_catch.HasCaught());
   }
   delete[] full_source;
 }
 
-
 TEST(StreamingSimpleScript) {
   // This script is unrealistically small, since no one chunk is enough to fill
   // the backing buffer of Scanner, let alone overflow it.
   const char* chunks[] = {"function foo() { ret", "urn 13; } f", "oo(); ",
                           NULL};
   RunStreamingTest(chunks);
 }
 
+TEST(StreamingScriptConstantArray) {
+  // When run with Ignition, tests that the streaming parser canonicalizes
+  // handles so that they are only added to the constant pool array once.
+  const char* chunks[] = {"var a = {};",
+                          "var b = {};",
+                          "var c = 'testing';",
+                          "var d = 'testing';",
+                          "13;",
+                          NULL};
+  RunStreamingTest(chunks);
+}
 
 TEST(StreamingBiggerScript) {
   const char* chunk1 =
       "function foo() {\n"
       "  // Make this chunk sufficiently long so that it will overflow the\n"
       "  // backing buffer of the Scanner.\n"
       "  var i = 0;\n"
       "  var result = 0;\n"
       "  for (i = 0; i < 13; ++i) { result = result + 1; }\n"
       "  result = 0;\n"
@@ skipping 1534 matching lines @@
 
   // Put the function into context1 and call it. Since the access check
   // callback always returns true, the call succeeds even though the tokens
   // are different.
   context1->Enter();
   context1->Global()->Set(context1, v8_str("fun"), fun).FromJust();
   v8::Local<v8::Value> x_value = CompileRun("fun('x')");
   CHECK_EQ(42, x_value->Int32Value(context1).FromJust());
   context1->Exit();
 }