[3.14] pythongh-128045: Mark unknown opcodes as deopting to themselves (pythonGH-128044) (python#134228)

* pythongh-128045: Mark unknown opcodes as deopting to themselves (pythonGH-128044)

Author: miss-islington

Include/internal/pycore_opcode_metadata.h

@@ -157,6 +157,13 @@ def generate_deopt_table(analysis: Analysis, out: CWriter) -> None:
         if inst.family is not None:
             deopt = inst.family.name
         deopts.append((inst.name, deopt))
+    defined = set(analysis.opmap.values())
+    for i in range(256):
+        if i not in defined:
+            deopts.append((f'{i}', f'{i}'))
+
+    assert len(deopts) == 256
+    assert len(set(x[0] for x in deopts)) == 256
     for name, deopt in sorted(deopts):
         out.emit(f"[{name}] = {deopt},\n")
     out.emit("};\n\n")