Re-enable const variant for PageTable::new

Author: h33p

src/structures/paging/page_table.rs

@@ -185,6 +185,16 @@ pub struct PageTable {
 
 impl PageTable {
     /// Creates an empty page table.
+    #[cfg(feature = "const_fn")]
+    #[inline]
+    pub const fn new() -> Self {
+        const EMPTY: PageTableEntry = PageTableEntry::new();
+        PageTable {
+            entries: [EMPTY; ENTRY_COUNT],
+        }
+    }
+
+    #[cfg(not(feature = "const_fn"))]
     #[inline]
     pub fn new() -> Self {
         const EMPTY: PageTableEntry = PageTableEntry::new();