Fix unused functions warnings in instrumentation.c.

[benjaminp]

clang -c -fno-strict-overflow -Wsign-compare -Wunreachable-code -DNDEBUG -g -O3 -Wall    -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Werror=implicit-function-declaration -fvisibility=hidden  -I../cpython/Include/internal -IObjects -IInclude -IPython -I. -I../cpython/Include    -DPy_BUILD_CORE -o Python/instrumentation.o ../cpython/Python/instrumentation.c
../cpython/Python/instrumentation.c:129:1: warning: unused function 'monitors_equals' [-Wunused-function]
monitors_equals(_Py_Monitors a, _Py_Monitors b)
^
../cpython/Python/instrumentation.c:150:1: warning: unused function 'monitors_and' [-Wunused-function]
monitors_and(_Py_Monitors a, _Py_Monitors b)
^
2 warnings generated.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot wasm32-emscripten node (pthreads) 3.x has failed when building commit 7b95d23.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1050/builds/1729) and take a look at the build logs.
4. Check if the failure is related to this commit (7b95d23) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1050/builds/1729

Failed tests:

• test_fileio

Failed subtests:

• testErrnoOnClosedTruncate - test.test_fileio.CAutoFileTests.testErrnoOnClosedTruncate

Summary of the results of the build (if available):

== Tests result: FAILURE ==

339 tests OK.

10 slowest tests:

• test_math: 1 min 24 sec
• test_lib2to3: 54.7 sec
• test_tokenize: 44.3 sec
• test_hashlib: 39.2 sec
• test_io: 39.1 sec
• test_capi: 37.1 sec
• test_unparse: 36.2 sec
• test_unicodedata: 23.0 sec
• test_pathlib: 18.2 sec
• test_statistics: 17.2 sec

1 test failed:
test_fileio

94 tests skipped:
test__xxinterpchannels test__xxsubinterpreters test_asyncgen
test_asyncio test_clinic test_cmd_line test_concurrent_futures
test_contextlib_async test_ctypes test_curses test_dbm_gnu
test_dbm_ndbm test_devpoll test_doctest test_docxmlrpc test_dtrace
test_embed test_epoll test_faulthandler test_fcntl test_file_eintr
test_fork1 test_ftplib test_gdb test_grp test_httplib
test_httpservers test_idle test_imaplib test_interpreters
test_ioctl test_kqueue test_launcher test_lzma test_mmap
test_msilib test_multiprocessing_fork
test_multiprocessing_forkserver test_multiprocessing_main_handling
test_multiprocessing_spawn test_nis test_openpty test_ossaudiodev
test_pdb test_peg_generator test_perf_profiler test_poll
test_poplib test_pty test_pwd test_readline test_regrtest
test_repl test_resource test_select test_selectors test_smtplib
test_smtpnet test_socket test_socketserver test_spwd test_ssl
test_stable_abi_ctypes test_startfile test_subprocess
test_sys_settrace test_syslog test_tcl test_telnetlib test_tix
test_tkinter test_tools test_ttk test_ttk_textonly test_turtle
test_urllib2 test_urllib2_localnet test_urllib2net test_urllibnet
test_venv test_wait3 test_wait4 test_webbrowser test_winconsoleio
test_winreg test_winsound test_wmi test_wsgiref test_xmlrpc
test_xmlrpc_net test_xxlimited test_zipfile64
test_zipimport_support test_zoneinfo
0:24:54 load avg: 7.21
0:24:54 load avg: 7.21 Re-running failed tests is not supported with --python host runner option.

Total duration: 24 min 54 sec

Click to see traceback logs

Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_fileio.py", line 274, in wrapper
    self.assertEqual(e.errno, errno.EBADF)
AssertionError: 28 != 8


Traceback (most recent call last):
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_fileio.py", line 272, in wrapper
    func(self, f)
  File "/opt/buildbot/bcannon-wasm/3.x.bcannon-wasm.emscripten-node-pthreads/build/Lib/test/test_fileio.py", line 302, in testErrnoOnClosedTruncate
    f.truncate(0)
OSError: [Errno 28] Invalid argument