alx32 96839a4720 [llvm-gsymutil] Ensure stable ordering of merged functions (#120796) ...

Previously, the test
`llvm/test/tools/llvm-gsymutil/ARM_AArch64/macho-gsym-merged-callsites-dsym.yaml`
[was disabled](https://github.com/llvm/llvm-project/pull/119957/files)
due to failing on Linux.

The issue is that the merged functions appear in a different order in
the final produced `gSYM`.
To ensure deterministic ordering of merged functions, we change the
sorting of functions to use the `stable_sort` algorithm. Before merged
functions, this was not an issue as the address is used as a comparator
in the sorting algorithm so there was no chance of two functions testing
as identical according to the comparator.

Confirmed that test now passes locally with
`-DLLVM_ENABLE_EXPENSIVE_CHECKS=ON`.

2024-12-20 16:00:52 -08:00

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