Fangrui Song 2f6e3df08a BPSectionOrderer: stabilize iteration order and node order ...

Exposed by the test added in the reverted #120514

* Fix libstdc++/libc++ differences due to nth_element. https://github.com/llvm/llvm-project/pull/125450#issuecomment-2631404178
* Fix LLVM_ENABLE_REVERSE_ITERATION=1 differences
* Fix potential issue in `currentSize += D::getSize(*sections[*sectionIdxs.begin()])` where DenseSet was used, though not covered by a test

2025-02-03 10:36:51 -08:00

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