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Summary: The old check for slot overlap treated 2 slots `S` and `T` as overlapping if there existed a CFG node in which both of the slots could possibly be active. That is overly conservative and caused stack blowups in Rust programs. Instead, check whether there is a single CFG node in which both of the slots are possibly active *together*. Fixes PR32488. Patch by Ariel Ben-Yehuda <ariel.byd@gmail.com> Reviewers: thanm, nagisa, llvm-commits, efriedma, rnk Reviewed By: thanm Subscribers: dotdash Differential Revision: https://reviews.llvm.org/D31583 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305193 91177308-0d34-0410-b5e6-96231b3b80d8
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