Add files

v8/include/cppgc/macros.h

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+// Copyright 2020 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_CPPGC_MACROS_H_
+#define INCLUDE_CPPGC_MACROS_H_
+
+#include <cstddef>
+
+#include "cppgc/internal/compiler-specific.h"
+
+namespace cppgc {
+
+// Use if the object is only stack allocated.
+#define CPPGC_STACK_ALLOCATED()                        \
+ public:                                               \
+  using IsStackAllocatedTypeMarker CPPGC_UNUSED = int; \
+                                                       \
+ private:                                              \
+  void* operator new(size_t) = delete;                 \
+  void* operator new(size_t, void*) = delete;          \
+  static_assert(true, "Force semicolon.")
+
+}  // namespace cppgc
+
+#endif  // INCLUDE_CPPGC_MACROS_H_