Ensure Array.prototype.indexOf returns +0 rather than -0

test/test262/test262.status

 # Copyright 2011 the V8 project authors. All rights reserved.
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@@ skipping 313 matching lines @@
   'built-ins/Object/keys/15.2.3.14-1-2': [PASS, FAIL_OK],
   'built-ins/Object/keys/15.2.3.14-1-3': [PASS, FAIL_OK],
 
   # Test bug https://github.com/tc39/test262/issues/405
   'intl402/Collator/prototype/compare/10.3.2_1_c': [PASS, FAIL_OK],
   'intl402/Collator/prototype/compare/10.3.2_CS_b_NN': [PASS, FAIL_OK],
   'intl402/Collator/prototype/compare/10.3.2_CS_c_NN': [PASS, FAIL_OK],
   'intl402/Collator/prototype/compare/10.3.2_CS_d_NN': [PASS, FAIL_OK],
   'intl402/Date/prototype/13.3.0_7': [PASS, FAIL_OK],
 
-  # Some tests are too strict, checking SameValue rather than ===
-  # https://github.com/tc39/test262/issues/435
-  'built-ins/Array/prototype/indexOf/15.4.4.14-5-9': [FAIL],
-  'built-ins/Array/prototype/lastIndexOf/15.4.4.15-5-9': [FAIL],
-
   # https://github.com/tc39/test262/issues/489
   # Test will pass in 0 or -GMT, but fail in +GMT
   'language/statements/class/subclass/builtin-objects/Date/regular-subclassing': [PASS, FAIL_OK],
 
   ############################ SKIPPED TESTS #############################
 
   # These tests take a looong time to run.
   'built-ins/decodeURI/S15.1.3.1_A1.10_T1': [SKIP],
   'built-ins/decodeURI/S15.1.3.1_A1.11_T1': [SKIP],
   'built-ins/decodeURI/S15.1.3.1_A1.11_T2': [SKIP],
@@ skipping 262 matching lines @@
   'language/statements/const/fn-name-gen': [SKIP],
   'language/statements/let/fn-name-arrow': [SKIP],
   'language/statements/let/fn-name-class': [SKIP],
   'language/statements/let/fn-name-cover': [SKIP],
   'language/statements/let/fn-name-fn': [SKIP],
   'language/statements/let/fn-name-gen': [SKIP],
   'test-api/Regress470113': [SKIP],
 }],  # ignition == True and (arch == arm or arch == arm64)
 
 ]