Blink GC plugin: require that GC derived classes do not override their new(size_t) operator.

tools/clang/blink_gc_plugin/tests/heap/stubs.h

Index: tools/clang/blink_gc_plugin/tests/heap/stubs.h
diff --git a/tools/clang/blink_gc_plugin/tests/heap/stubs.h b/tools/clang/blink_gc_plugin/tests/heap/stubs.h
index ca2b2595177117d63cd4b28d093b071d6d1f8e8a..a9e64f589276decbe1f013a38d575294ef60ca84 100644
--- a/tools/clang/blink_gc_plugin/tests/heap/stubs.h
+++ b/tools/clang/blink_gc_plugin/tests/heap/stubs.h
@@ -7,6 +7,14 @@
 
 #include "stddef.h"
 
+#define WTF_MAKE_FAST_ALLOCATED                 \
+    public:                                     \
+    void* operator new(size_t, void* p);        \
+    void* operator new[](size_t, void* p);      \
+    void* operator new(size_t size);            \
+    private:                                    \
+    typedef int __thisIsHereToForceASemicolonAfterThisMacro
+
 namespace WTF {
 
 template<typename T> class RefCounted { };