fs: implement PooledBuffer

libraries/libvapours/include/vapours/util/util_alignment.hpp

@@ -17,16 +17,11 @@
 #pragma once
 #include <vapours/common.hpp>
 #include <vapours/assert.hpp>
+#include <vapours/util/util_bitutil.hpp>
 
 namespace ams::util {
 
     /* Utilities for alignment to power of two. */
-    template<typename T>
-    constexpr ALWAYS_INLINE bool IsPowerOfTwo(T value) {
-        using U = typename std::make_unsigned<T>::type;
-        return (static_cast<U>(value) & static_cast<U>(value - 1)) == 0;
-    }
-
     template<typename T>
     constexpr ALWAYS_INLINE T AlignUp(T value, size_t alignment) {
         using U = typename std::make_unsigned<T>::type;