[cling][NFC] Cleanup DeclUnloader
#13534
Merged
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This pull request moves helper functions to an anonymous namespace at the beginning of the TU. There are no functional changes in this PR; instead it makes the code more readable.
The follow-up PR, which is the important thing, fixes a number of issues in the handling of instantiation of member functions of templated classes, which should fix #10049 and all the issues mentioned there 🚀.
Changes or fixes:
#pragma clang diagnostic push
Checklist: