[llvm] LiveIntervals: Use BumpPtrAllocator (PR #127057)

[Nikita Popov via llvm-commits]

nikic wrote:

Current max-rss results: https://llvm-compile-time-tracker.com/compare.php?from=8600d89e55b866186a2dad2e2b4c85bd96150375&to=a2ee139249e919ae4a4ace66870685ea333ef30e&stat=max-rss 30% increase for the clang build. Hopefully this is due to not using SpecificBumpPtrAllocator...

https://github.com/llvm/llvm-project/pull/127057