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 @JacobCoffee for commit bd41fda 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F30617%2Fmerge

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

[bedevere-bot]

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

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F30617%2Fmerge

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

[ambv]

!buildbot aarch64 Fedora Stable Clang

[bedevere-bot]

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

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F30617%2Fmerge

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

[ambv]

!buildbot PPC64LE .* Refleaks PR

[bedevere-bot]

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

The command will test the builders whose names match following regular expression: PPC64LE .* Refleaks PR

The builders matched are:

• PPC64LE Fedora Rawhide Refleaks PR
• PPC64LE CentOS9 Refleaks PR
• PPC64LE Fedora Stable Refleaks PR
• PPC64LE RHEL8 Refleaks PR
• PPC64LE Fedora Rawhide NoGIL refleaks PR

[ambv]

It's weird that Windows 11 and PPC64LE refleaks buildbots are consistently failing with failures that don't look related to external inspection infrastructure:

8 tests failed: test_capi test_embed test_import test_interpreters test_json test_logging test_sysconfig test_zoneinfo 

Refleaks on all other platforms, including s390x, are clean. At the moment we're treating this as unrelated and we'll be looking at a solution to those failures separately.