Untangle RNG from v8 core

src/base/macros.h

Index: src/base/macros.h
diff --git a/src/base/macros.h b/src/base/macros.h
index 57191edcfebb36090821f546bb53071e94e7842e..736a656ed9f11e09ce217a6bf7b4a479f0b034d9 100644
--- a/src/base/macros.h
+++ b/src/base/macros.h
@@ -109,4 +109,12 @@ template <int> class StaticAssertionHelper { };
 template <typename T>
 inline void USE(T) { }
 
+
+#define IS_POWER_OF_TWO(x) ((x) != 0 && (((x) & ((x) - 1)) == 0))
+
+// The following macro works on both 32 and 64-bit platforms.
+// Usage: instead of writing 0x1234567890123456
+//      write V8_2PART_UINT64_C(0x12345678,90123456);
+#define V8_2PART_UINT64_C(a, b) (((static_cast<uint64_t>(a) << 32) + 0x##b##u))
+
 #endif   // V8_BASE_MACROS_H_