fix details

Signed-off-by: martinvuyk <martin.vuyklop@gmail.com>

stdlib/src/builtin/sort.mojo

@@ -15,7 +15,6 @@
 These are Mojo built-ins, so you don't need to import them.
 """
 
-from builtin.builtin_list import _lit_mut_cast
 from collections import List
 from sys import bitwidthof
 from math import ceil

stdlib/src/builtin/type_aliases.mojo

@@ -44,14 +44,7 @@ alias OriginSet = __mlir_type.`!lit.origin.set`
 """A set of origin parameters."""
 
 
-struct _origin_inner[is_mutable: Bool, //]:
-    alias type = __mlir_type[
-        `!lit.origin<`,
-        is_mutable.value,
-        `>`,
-    ]
-
-
+@value
 @register_passable("trivial")
 struct Origin[is_mutable: Bool]:
     """This represents a origin reference for a memory value.

stdlib/src/utils/span.mojo

@@ -382,13 +382,3 @@ struct Span[
         """
         for element in self:
             element[] = value
-
-    fn get_immutable(self) -> Span[T, _lit_mut_cast[origin, False].result]:
-        """
-        Return an immutable version of this span.
-        Returns:
-            A span covering the same elements, but without mutability.
-        """
-        return Span[T, _lit_mut_cast[origin, False].result](
-            ptr=self._data, length=self._len
-        )