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Author SHA1 Message Date
Daniil Suchkov 706b22e3e4 [SimpleLoopUnswitch] Drop uses of instructions before block deletion 
Currently if instructions defined in a block are used in unreachable
blocks and SimpleLoopUnswitch attempts deleting the block, it triggers
assertion "Uses remain when a value is destroyed!".
This patch fixes it by replacing all uses of instructions from BB with
undefs before BB deletion.

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D80551
 2020-05-27 18:25:18 +07:00
Daniil Suchkov fc44da746f Add test exposing a bug in SimpleLoopUnswitch. 2020-05-27 15:02:28 +07:00