Duncan P. N. Exon Smith 7df1db57b3 UseListOrder: Guarantee that shuffles change use-list order
Change shuffleUseLists() always to change use-list order by rejecting
orders that have no changes.

This is part of PR5680.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214584 91177308-0d34-0410-b5e6-96231b3b80d8
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