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[LoopSimplifyCFG] Delete dead exiting edges

Authored by mkazantsev on Dec 23 2018, 11:41 PM.

Description

[LoopSimplifyCFG] Delete dead exiting edges

This patch teaches LoopSimplifyCFG to remove dead exiting edges
from loops.

Differential Revision: https://reviews.llvm.org/D54025
Reviewed By: fedor.sergeev

llvm-svn: 350049