WorkerGlobalScope: take IOS GC branch for WPE

The aim is to make the GC more reliable on low-memory platforms.
In WorkerGlobalScope::deleteJSCodeAndGC the change is to
collect even if called with 'Synchronous::No'

Author: tomasz-karczewski-red

Source/WebCore/workers/WorkerGlobalScope.cpp

@@ -606,7 +606,7 @@ void WorkerGlobalScope::deleteJSCodeAndGC(Synchronous synchronous)
             return;
         }
     }
-#if PLATFORM(IOS_FAMILY)
+#if PLATFORM(IOS_FAMILY) || PLATFORM(WPE)
     if (!vm().heap.currentThreadIsDoingGCWork()) {
         vm().heap.collectNowFullIfNotDoneRecently(JSC::Async);
         return;