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Summary: Update the demotion logic in WinEHPrepare to avoid creating new cleanups by walking predecessors as necessary to insert stores for EH-pad PHIs. Also avoid creating stores for EH-pad PHIs that have no uses. The store/load placement is still pretty naive. Likely future improvements (at least for optimized compiles) include: - Share loads for related uses as possible - Coalesce non-interfering use/def-related PHIs - Store at definition point rather than each PHI pred for non-interfering lifetimes. Reviewers: rnk, majnemer Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D11955 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244894 91177308-0d34-0410-b5e6-96231b3b80d8