test__opcode fails with missing 'jump_backward' in specialization stats

[furkanonder]

Bug report

Bug description:

When running the test__opcode test with a build that uses --enable-pystats, there is a mismatch between the expected specialized opcodes and the actual ones. The test is expecting jump_backward in the specialized opcodes list, but it's not present in the actual stats.

Configuration

./configure --with-pydebug --enable-pystats

Test Output

╰─$ ./python -m test test__opcode                                                                                                                                                                           82595ms
Using random seed: 2739258338
0:00:00 load avg: 0.97 Run 1 test sequentially in a single process
0:00:00 load avg: 0.97 [1/1] test__opcode
test test__opcode failed -- Traceback (most recent call last):
  File "/home/arf/Desktop/cpython/Lib/test/test__opcode.py", line 131, in test_specialization_stats
    self.assertCountEqual(stats.keys(), specialized_opcodes)
    ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: Element counts were not equal:
First has 0, Second has 1:  'jump_backward'

0:00:00 load avg: 0.97 [1/1/1] test__opcode failed (1 failure)

== Tests result: FAILURE ==

1 test failed:
    test__opcode

Total duration: 52 ms
Total tests: run=7 failures=1
Total test files: run=1/1 failed=1
Result: FAILURE

Environment

• OS: Arch Linux (Linux 6.14.2-arch1-1)

CPython versions tested on:

CPython main branch, 3.14

Operating systems tested on:

Linux

[furkanonder]

bisect to #128918

@colesbury @markshannon