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FastISel: take care to update iterators when removing instructions.
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Authored by t.p.northover on Dec 7 2018, 3:00 AM.
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Summary

We keep a few iterators into the basic block we're selecting while performing FastISel. Usually this is fine, but occasionally code wants to remove already-emitted instructions. When this happens we have to be careful to update those iterators so they're not pointint at dangling memory.

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rL LLVM