Use bit-fields for space saving in PointerEventsHitRules

Source/core/rendering/PointerEventsHitRules.cpp

Index: Source/core/rendering/PointerEventsHitRules.cpp
diff --git a/Source/core/rendering/PointerEventsHitRules.cpp b/Source/core/rendering/PointerEventsHitRules.cpp
index 1691f0dfb8c1da42fa38cbaf0495132a702a82e4..375801d230942524e92fd1b1d159ff900064796b 100644
--- a/Source/core/rendering/PointerEventsHitRules.cpp
+++ b/Source/core/rendering/PointerEventsHitRules.cpp
@@ -20,8 +20,16 @@
 #include "config.h"
 #include "core/rendering/PointerEventsHitRules.h"
 
+#include "wtf/Assertions.h"
+
 namespace blink {
 
+struct SameSizeAsPointerEventsHitRules {
+    unsigned bitfields;
+};
+
+COMPILE_ASSERT(sizeof(PointerEventsHitRules) <= sizeof(SameSizeAsPointerEventsHitRules), PointerEventsHitRules_should_stay_small);
+
 PointerEventsHitRules::PointerEventsHitRules(EHitTesting hitTesting, const HitTestRequest& request, EPointerEvents pointerEvents)
     : requireVisible(false)
     , requireFill(false)