NAKAMURA Takumi 519ea284af SLPVectorizer.cpp: Avoid std::stable_sort(properlyDominates()).
properlyDominates() shouldn't be used as sort key. It causes different output between stdlibc++ and libc++.
Instead, I introduced RPOT. In most cases, it works for CSE.

llvm-svn: 318743
2017-11-21 09:41:01 +00:00
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