Revert "Delete LOAD_CONST_IMMORTAL (it exists in 3.14 but not 15)"

This reverts commit 7a1cc7f.

Author: AA-Turner

Doc/library/dis.rst

@@ -1964,6 +1964,11 @@ but are replaced by real opcodes or removed before bytecode is generated.
    ``SETUP_CLEANUP`` or ``SETUP_WITH``.
 
 
+.. opcode:: LOAD_CONST_IMMORTAL (consti)
+
+   Works as :opcode:`LOAD_CONST`, but is more efficient for immortal objects.
+
+
 .. opcode:: JUMP
             JUMP_NO_INTERRUPT
 

Doc/whatsnew/3.14.rst

@@ -2864,7 +2864,7 @@ Pseudo-instructions
 * Add the :opcode:`!LOAD_CONST_MORTAL` pseudo instruction.
   (Contributed by Mark Shannon in :gh:`128685`.)
 
-* Add the :opcode:`!LOAD_CONST_IMMORTAL` pseudo instruction,
+* Add the :opcode:`LOAD_CONST_IMMORTAL` pseudo instruction,
   which does the same as :opcode:`!LOAD_CONST`, but is more efficient
   for immortal objects.
   (Contributed by Mark Shannon in :gh:`125837`.)

Misc/NEWS.d/3.14.0a2.rst

@@ -1400,7 +1400,7 @@ The :class:`memoryview` type now supports subscription, making it a
 .. nonce: KlCdgD
 .. section: Core and Builtins
 
-Adds :opcode:`LOAD_SMALL_INT` and :opcode:`!LOAD_CONST_IMMORTAL`
+Adds :opcode:`LOAD_SMALL_INT` and :opcode:`LOAD_CONST_IMMORTAL`
 instructions. ``LOAD_SMALL_INT`` pushes a small integer equal to the
 ``oparg`` to the stack. ``LOAD_CONST_IMMORTAL`` does the same as
 ``LOAD_CONST`` but is more efficient for immortal objects. Removes