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Summary: Depends on https://reviews.llvm.org/D59069. https://bugs.llvm.org/show_bug.cgi?id=40979 describes a bug in which the -coro-split pass would assert that a use was across a suspend point from a definition. Normally this would mean that a value would "spill" across a suspend point and thus need to be stored in the coroutine frame. However, in this case the use was unreachable, and so it would not be necessary to store the definition on the frame. To prevent the assert, simply remove unreachable basic blocks from a coroutine function before computing spills. This avoids the assert reported in PR40979. Reviewers: GorNishanov, tks2103 Reviewed By: GorNishanov Subscribers: EricWF, jdoerfert, llvm-commits, lewissbaker Tags: #llvm Differential Revision: https://reviews.llvm.org/D59068 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@355852 91177308-0d34-0410-b5e6-96231b3b80d8