gh-129223: Do not allow the compiler to optimise away symbols for debug sections

[pablogsal]

• Issue: The compiler may optimise away globals with debug offsets #129223

[pablogsal]

This change is to avoid returning NULL without an error set as things under search_map_for_section may return without setting an error.

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @pablogsal for commit bd41fda 🤖

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[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @JacobCoffee for commit bd41fda 🤖

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[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @ambv for commit bd41fda 🤖

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[ambv]

!buildbot aarch64 Fedora Stable Clang

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @pablogsal for commit 596a58f 🤖

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If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.

[ambv]

The test_interpreters.test_create_many_threaded failure looks unrelated to me, it's a failure to import encodings in one of the sub-interpreters on a thread:
https://buildbot.python.org/#/builders/1255/builds/370/steps/6/logs/stdio