Untangle RNG from v8 core

src/utils.h

 // Copyright 2012 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 V8_UTILS_H_
 #define V8_UTILS_H_
 
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "src/allocation.h"
+#include "src/base/macros.h"
 #include "src/checks.h"
 #include "src/globals.h"
 #include "src/list.h"
 #include "src/platform.h"
 #include "src/vector.h"
 
 namespace v8 {
 namespace internal {
 
 // ----------------------------------------------------------------------------
 // General helper functions
 
-#define IS_POWER_OF_TWO(x) ((x) != 0 && (((x) & ((x) - 1)) == 0))
-
 // Returns true iff x is a power of 2. Cannot be used with the maximally
 // negative value of the type T (the -1 overflows).
 template <typename T>
 inline bool IsPowerOf2(T x) {
   return IS_POWER_OF_TWO(x);
 }
 
 
 // X must be a power of 2.  Returns the number of trailing zeros.
 inline int WhichPowerOf2(uint32_t x) {
@@ skipping 1568 matching lines @@
   }
 
   *index = result;
   return true;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_UTILS_H_