[test262] Expose gc() to test262 harness

test262 tests use this to trigger a gc and test WeakRefs

Bug: v8:8179
Change-Id: I84ca88f0bf11734ea65d7f6c2a5e5e2d13dccb7d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1714871Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62874}

test/test262/harness-adapt.js

@@ -98,7 +98,10 @@ function RealmOperators(realm) {
     createRealm() {
       return RealmOperators(Realm.createAllowCrossRealmAccess());
     },
-    global: Realm.eval(realm, 'this')
+    global: Realm.eval(realm, 'this'),
+    gc() {
+      v8GC();
+    }
   };
   $262.global.$262 = $262;
   return $262;

test/test262/test262.status

@@ -535,29 +535,24 @@
   'language/statements/class/elements/syntax/early-errors/grammar-private-environment-on-class-heritage-recursive': [FAIL],
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=8179
-  'built-ins/FinalizationGroup/gc-has-one-chance-to-call-cleanupCallback': [FAIL],
-  'built-ins/FinalizationGroup/prototype/register/return-undefined-register-itself': [FAIL],
   'built-ins/FinalizationGroup/FinalizationGroupCleanupIteratorPrototype/next-job-not-active-throws': [FAIL],
-  'built-ins/FinalizationGroup/FinalizationGroupCleanupIteratorPrototype/next-length': [FAIL],
-  'built-ins/FinalizationGroup/FinalizationGroupCleanupIteratorPrototype/next-missing-internal-throws': [FAIL],
-  'built-ins/FinalizationGroup/FinalizationGroupCleanupIteratorPrototype/next-name': [FAIL],
-  'built-ins/FinalizationGroup/FinalizationGroupCleanupIteratorPrototype/next-not-object-throws': [FAIL],
-  'built-ins/FinalizationGroup/FinalizationGroupCleanupIteratorPrototype/next-prop-desc': [FAIL],
-  'built-ins/FinalizationGroup/FinalizationGroupCleanupIteratorPrototype/proto': [FAIL],
   'built-ins/FinalizationGroup/FinalizationGroupCleanupIteratorPrototype/Symbol.toStringTag': [FAIL],
-  'built-ins/FinalizationGroup/prototype/cleanupSome/callback-iterator-proto': [FAIL],
-  'built-ins/FinalizationGroup/prototype/cleanupSome/cleanupcallback-iterator-proto': [FAIL],
-  'built-ins/FinalizationGroup/prototype/cleanupSome/cleanup-prevented-with-reference': [FAIL],
-  'built-ins/FinalizationGroup/prototype/cleanupSome/cleanup-prevented-with-unregister': [FAIL],
-  'built-ins/FinalizationGroup/prototype/cleanupSome/gc-cleanup-not-prevented-with-wr-deref': [FAIL],
-  'built-ins/FinalizationGroup/prototype/cleanupSome/iterator-dynamic': [FAIL],
-  'built-ins/FinalizationGroup/prototype/cleanupSome/iterator-holdings-multiple-values': [FAIL],
   'built-ins/FinalizationGroup/prototype/cleanupSome/poisoned-callback-throws': [FAIL],
   'built-ins/FinalizationGroup/prototype/cleanupSome/poisoned-cleanup-callback-throws': [FAIL],
-  'built-ins/FinalizationGroup/prototype/cleanupSome/return-undefined-with-gc': [FAIL],
   'built-ins/FinalizationGroup/prototype/register/holdings-same-as-target': [FAIL],
   'built-ins/FinalizationGroup/prototype/register/unregisterToken-same-as-holdings-and-target': [FAIL],
+  'built-ins/FinalizationGroup/prototype/cleanupSome/cleanup-prevented-with-reference': [FAIL],
+  'built-ins/FinalizationGroup/prototype/register/return-undefined-register-itself': [FAIL],
+
+  # https://github.com/tc39/test262/issues/2256
+  'built-ins/FinalizationGroup/prototype/cleanupSome/cleanup-prevented-with-unregister': [FAIL],
+
+  # https://github.com/tc39/test262/issues/2239
   'built-ins/WeakRef/prototype/deref/gc-cleanup-not-prevented-with-wr-deref': [FAIL],
+  'built-ins/FinalizationGroup/prototype/cleanupSome/gc-cleanup-not-prevented-with-wr-deref': [FAIL],
+
+  # https://github.com/tc39/test262/issues/2255
+  'built-ins/FinalizationGroup/prototype/cleanupSome/iterator-holdings-multiple-values': [FAIL],
 
   ######################## NEEDS INVESTIGATION ###########################
 

test/test262/testcfg.py

@@ -58,6 +58,7 @@ FEATURE_FLAGS = {
   'Promise.allSettled': '--harmony-promise-all-settled',
   'FinalizationGroup': '--harmony-weak-refs',
   'WeakRef': '--harmony-weak-refs',
+  'host-gc-required': '--expose-gc-as=v8GC',
 }
 
 SKIPPED_FEATURES = set(['class-methods-private',