Add page allocation utility functions

Source/Engine/Platform/Base/PlatformBase.h

@@ -316,6 +316,25 @@ public:
     /// <param name="ptr">A pointer to the memory block to deallocate.</param>
     static void Free(void* ptr) = delete;
 
+    /// <summary>
+    /// Returns the OS's default page size that can be used with AllocatePages.
+    /// </summary>
+    static uint64 GetDefaultPageSize() = delete;
+
+    /// <summary>
+    /// Allocates pages memory block.
+    /// </summary>
+    /// <param name="numPages">The number of pages to allocate.</param>
+    /// <param name="pageSize">The size of single page. Use GetDefaultPageSize() or provide compatible, custom size.</param>
+    /// <returns>The pointer to the allocated pages in memory.</returns>
+    static void* AllocatePages(uint64 numPages, uint64 pageSize) = delete;
+
+    /// <summary>
+    /// Frees allocated pages memory block.
+    /// </summary>
+    /// <param name="ptr">The pointer to the pages to deallocate.</param>
+    static void FreePages(void* ptr) = delete;
+
 public:
 
     /// <summary>