gh-121404: pass metadata to compiler_enter_scope (optionally) so that codegen functions don't need to set it on the code unit

[iritkatriel]

• Issue: split compiler.c into compiler and codegen #121404

[markshannon]

Looks good

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Windows11 Bigmem 3.x has failed when building commit e077b20.

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/#/builders/1079/builds/4575) and take a look at the build logs.
4. Check if the failure is related to this commit (e077b20) 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/#/builders/1079/builds/4575

Failed tests:

• test_zipfile64

Failed subtests:

• testStored - test.test_zipfile64.TestsWithSourceFile.testStored

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

==

Click to see traceback logs

Traceback (most recent call last):
  File "R:\buildarea\3.x.ambv-bb-win11.bigmem\build\Lib\runpy.py", line 198, in _run_module_as_main
    return _run_code(code, main_globals, None,
                     "__main__", mod_spec)
  File "R:\buildarea\3.x.ambv-bb-win11.bigmem\build\Lib\runpy.py", line 88, in _run_code
    exec(code, run_globals)
    ~~~~^^^^^^^^^^^^^^^^^^^
  File "R:\buildarea\3.x.ambv-bb-win11.bigmem\build\Lib\test\__main__.py", line 2, in <module>
    main(_add_python_opts=True)
    ~~~~^^^^^^^^^^^^^^^^^^^^^^^
  File "R:\buildarea\3.x.ambv-bb-win11.bigmem\build\Lib\test\libregrtest\main.py", line 747, in main
    Regrtest(ns, _add_python_opts=_add_python_opts).main(tests=tests)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
  File "R:\buildarea\3.x.ambv-bb-win11.bigmem\build\Lib\test\libregrtest\main.py", line 739, in main
    exitcode = self.run_tests(selected, tests)
  File "R:\buildarea\3.x.ambv-bb-win11.bigmem\build\Lib\test\libregrtest\main.py", line 576, in run_tests
    return self._run_tests(selected, tests)
           ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "R:\buildarea\3.x.ambv-bb-win11.bigmem\build\Lib\test\libregrtest\main.py", line 556, in _run_tests
    self.finalize_tests(coverage)
    ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "R:\buildarea\3.x.ambv-bb-win11.bigmem\build\Lib\test\libregrtest\main.py", line 454, in finalize_tests
    self.results.write_junit(self.junit_filename)
    ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
  File "R:\buildarea\3.x.ambv-bb-win11.bigmem\build\Lib\test\libregrtest\results.py", line 193, in write_junit
    f.write(s)
    ~~~~~~~^^^
OSError: [Errno 28] No space left on device


Traceback (most recent call last):
  File "R:\buildarea\3.x.ambv-bb-win11.bigmem\build\Lib\test\test_zipfile64.py", line 75, in testStored
    self.zipTest(TESTFN2, zipfile.ZIP_STORED)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "R:\buildarea\3.x.ambv-bb-win11.bigmem\build\Lib\test\test_zipfile64.py", line 45, in zipTest
    zipfp.writestr("testfn%d" % num, self.data)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "R:\buildarea\3.x.ambv-bb-win11.bigmem\build\Lib\zipfile\__init__.py", line 1936, in writestr
    dest.write(data)
    ~~~~~~~~~~^^^^^^
  File "R:\buildarea\3.x.ambv-bb-win11.bigmem\build\Lib\zipfile\__init__.py", line 1247, in write
    self._fileobj.write(data)
    ~~~~~~~~~~~~~~~~~~~^^^^^^
OSError: [Errno 28] No space left on device