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Author SHA1 Message Date
Alina Sbirlea 6442b56974 [MemorySSA] Update Phi simplification. 
When simplifying a Phi to the unique value found incoming, check that
there wasn't a Phi already created to break a cycle. If so, remove it.
Resolves PR43541.

Some additional nits included.

llvm-svn: 374471
 2019-10-10 23:27:21 +00:00