Rollup merge of #77441 - couchand:2020-10/fix-75504, r=jonas-schievink

Fix AVR stack corruption bug

Updates the Rust LLVM fork to pull in a fix for a stack corruption bug in AVR platform interrupt code lowering.

Fixes #75504

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It looks like this is also pulling in a register selection fix by @Amanieu and @tambry that hasn't merged yet; I don't see an open PR for that update.
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Jonas Schievink 2020-10-02 20:27:13 +02:00 committed by GitHub
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Subproject commit 2c56ba7db75b536b0432228b4760ed79174eca30
Subproject commit e8b556b6a8836147429abe391d6ed18806867b45