Fix some gc zone mismatches

Author: Aidan Lee

src/hx/thread/CountingSemaphore.apple.cpp

@@ -21,12 +21,15 @@ hx::thread::CountingSemaphore_obj::CountingSemaphore_obj(int value) : impl(new I
 
 void hx::thread::CountingSemaphore_obj::acquire()
 {
-	hx::AutoGCFreeZone zone;
+	hx::EnterGCFreeZone();
 
 	if (0 != dispatch_semaphore_wait(impl->semaphore, DISPATCH_TIME_FOREVER))
 	{
+		hx::ExitGCFreeZone();
 		hx::Throw(HX_CSTRING("Failed to wait for semaphore"));
 	}
+
+	hx::ExitGCFreeZone();
 }
 
 void hx::thread::CountingSemaphore_obj::release()

src/hx/thread/CountingSemaphore.posix.cpp

@@ -32,6 +32,7 @@ void hx::thread::CountingSemaphore_obj::acquire()
 
 	if (0 != sem_wait(&impl->semaphore))
 	{
+		hx::ExitGCFreeZone();
 		hx::Throw(HX_CSTRING("Failed to wait on semaphore"));
 	}
 

src/hx/thread/CountingSemaphore.win32.cpp

@@ -27,10 +27,11 @@ hx::thread::CountingSemaphore_obj::CountingSemaphore_obj(int value) : impl(new I
 
 void hx::thread::CountingSemaphore_obj::acquire()
 {
-	hx::AutoGCFreeZone zone;
+	hx::EnterGCFreeZone();
 
 	if (NO_ERROR != WaitForSingleObject(impl->semaphore, INFINITE))
 	{
+		hx::ExitGCFreeZone();
 		hx::Throw(HX_CSTRING("Failed to wait for semaphore"));
 	}
 }