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Author SHA1 Message Date
Matthias Braun 4040c0f4ec BranchFolder: Fix invalid undef flags after merge. 
It is legal to merge instructions with different undef flags; However we
must drop the undef flag from the merged instruction if it isn't present
everywhere.

This fixes http://llvm.org/PR30199

llvm-svn: 281957
 2016-09-20 01:14:42 +00:00