[PATCH] D39888: [lsan] Only use VM_MEMORY_OS_ALLOC_ONCE on Darwin versions that support it

[Francis Ricci via Phabricator via llvm-commits]

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Because macOS changes quite a bit from version to version, we (or at least I) don't have strong plans to support LSan outside of 10.11+. Not sure what darwin used to store singleton kernel allocations before this page was introduced, but I assume that just not handling those allocations will lead to a ton of false positives. I'm inclined to let this fail on old versions unless there's someone willing to do the work to make sure they're properly supported. cc @kubamracek


https://reviews.llvm.org/D39888