Reduce boot-up memory use of V8.

src/utils.h

Index: src/utils.h
===================================================================
--- src/utils.h	(revision 10407)
+++ src/utils.h	(working copy)
@@ -153,11 +153,9 @@
 }
 
 
-// Returns the smallest power of two which is >= x. If you pass in a
-// number that is already a power of two, it is returned as is.
-// Implementation is from "Hacker's Delight" by Henry S. Warren, Jr.,
-// figure 3-3, page 48, where the function is called clp2.
-inline uint32_t RoundUpToPowerOf2(uint32_t x) {
+template<typename int_type>
+inline int RoundUpToPowerOf2(int_type x_argument) {
+  uintptr_t x = static_cast<uintptr_t>(x_argument);
   ASSERT(x <= 0x80000000u);
   x = x - 1;
   x = x | (x >> 1);
@@ -165,7 +163,7 @@
   x = x | (x >> 4);
   x = x | (x >> 8);
   x = x | (x >> 16);
-  return x + 1;
+  return static_cast<int_type>(x + 1);
 }