FullGCActivityCallback: take IOS GC branch for WPE

The aim is to make the GC more reliable on low-memory platforms.
In FullGCActivityCallback, the change is
to do not bail out of GC early.

Author: tomasz-karczewski-red

Source/JavaScriptCore/heap/FullGCActivityCallback.cpp

@@ -41,7 +41,7 @@ void FullGCActivityCallback::doCollection(VM& vm)
     Heap& heap = vm.heap;
     m_didGCRecently = false;
 
-#if !PLATFORM(IOS_FAMILY) || PLATFORM(MACCATALYST)
+#if (!PLATFORM(IOS_FAMILY) && !PLATFORM(WPE)) || PLATFORM(MACCATALYST)
     MonotonicTime startTime = MonotonicTime::now();
     if (MemoryPressureHandler::singleton().isUnderMemoryPressure() && heap.isPagedOut()) {
         cancel();