Ellis Hoag e72209db35 [MachineSink] Fix stable sort comparator (#116705) ...

Fix the comparator in `stable_sort()` to satisfy the strict weak
ordering requirement.

In https://github.com/llvm/llvm-project/pull/115367 this comparator was
changed to use `getCycleDepth()` when `shouldOptimizeForSize()` is true.
However, I mistakenly changed to logic so that we use `LHSFreq <
RHSFreq` if **either** of them are zero. This causes us to fail the last
requirment (https://en.cppreference.com/w/cpp/named_req/Compare).

> if comp(a, b) == true and comp(b, c) == true then comp(a, c) == true

2024-11-19 16:15:35 -08:00

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