Iñaki Amatria Barral 6eefadd8ef [flang][Semantics] Ensure deterministic mod file output (#129669) ...

This PR is a follow-up to #128655.

It adds another test to ensure deterministic ordering in `.mod` files
and includes related changes to prevent non-deterministic ordering
caused by iterating over a set ordered by heap pointers. This issue is
particularly noticeable when using Flang as a library and compiling the
same files multiple times.

The reduced test case is as minimal as possible. We were unable to
reproduce the issue with a smaller set of files.

2025-03-05 08:27:17 +01:00

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