commit 5865df5baae7b74fa87311ce3867244183cc1325
author Max Kazantsev <max.kazantsev@azul.com> Thu Jan 17 12:25:40 2019 +0000
committer Max Kazantsev <max.kazantsev@azul.com> Thu Jan 17 12:25:40 2019 +0000
tree 28e1dcb04a93dd8409a71ab9de0db342766adf0a
parent f22ff9cc9364bc9f515a6c017935fab7b83080e0

[LoopSimplifyCFG] Fix order of deletion of complex dead subloops

Function `DeleteDeadBlock` requires that all predecessors of a block
being deleted have already been deleted, with the exception of a
single-block loop. When we use it for removal of dead subloops that
contain more than one block, we may not fulfull this requirement and
fail an assertion.

This patch replaces invocation of `DeleteDeadBlock` with a generalized
version `DeleteDeadBlocks` that is able to deal with multiple dead blocks,
even if they contain some cycles.

Differential Revision: https://reviews.llvm.org/D56121
Reviewed By: fedor.sergeev


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351433 91177308-0d34-0410-b5e6-96231b3b80d8