Move PAGE_SIZE from hulk.hippo to hulk.pagetable

src/hulk/pagetable.d

@@ -16,6 +16,9 @@ enum ulong PT_GLOBAL = 0x100u;
 enum ulong PT_NO_EXECUTE = 0x8000_0000_0000_0000u;
 /** @} */
 
+/** Page size in bytes. */
+enum ulong PAGE_SIZE = 4096u;
+
 /**
  * Structure that represents a page table entry.
  */