9f4e8bca03
There are two places where the nondeterministic iteration order of `DenseMap` (the original type of `startupSectionIdxUNs`) causes the output function order to be nondeterministic.16e2e7f591/lld/include/lld/Common/BPSectionOrdererBase.inc (L240-L245)16e2e7f591/lld/include/lld/Common/BPSectionOrdererBase.inc (L267-L268)The fix is to use `MapVector` whose iteration order is guaranteed to be deterministic. To test, I built a large binary several times and observed this value no longer changes.16e2e7f591/lld/include/lld/Common/BPSectionOrdererBase.inc (L410-L411)It seems that this regresses linktime by a few seconds, but I believe the tradeoff is worthwhile.