tree f09289902767e5888de59b39314d56f1ce83c55e
parent 4390c721cba09597037578100948bbc83cc41b16
author Max Kazantsev <max.kazantsev@azul.com> 1549957687 +0000
committer Max Kazantsev <max.kazantsev@azul.com> 1549957687 +0000

[LoopSimplifyCFG] Pay respect to LCSSA when removing dead blocks

Utility function that we use for blocks deletion always unconditionally removes
one-input Phis. In LoopSimplifyCFG, it can lead to breach of LCSSA form.
This patch alters this function to keep them if needed.

Differential Revision: https://reviews.llvm.org/D57231
Reviewed By: fedor.sergeev

llvm-svn: 353803