pythongh-87729: add LOAD_SUPER_ATTR to 3.12 What's New (pythonGH-105125)

(cherry picked from commit 7fbac51)

Co-authored-by: Carl Meyer <carl@oddbird.net>

Doc/whatsnew/3.12.rst

@@ -899,6 +899,10 @@ Optimizations
   the :mod:`tokenize` module. (Contributed by Marta Gómez Macías and Pablo Galindo
   in :gh:`102856`.)
 
+* Speed up :func:`super` method calls and attribute loads via the
+  new :opcode:`LOAD_SUPER_ATTR` instruction. (Contributed by Carl Meyer and
+  Vladimir Matveev in :gh:`103497`.)
+
 
 CPython bytecode changes
 ========================
@@ -917,6 +921,9 @@ CPython bytecode changes
   :opcode:`LOAD_LOCALS` plus :opcode:`LOAD_FROM_DICT_OR_DEREF`. (Contributed
   by Jelle Zijlstra in :gh:`103764`.)
 
+* Add the :opcode:`LOAD_SUPER_ATTR` instruction. (Contributed by Carl Meyer and
+  Vladimir Matveev in :gh:`103497`.)
+
 Demos and Tools
 ===============