Michael Kuperstein 2720248ae5 Fix slightly too aggressive conact_vector optimization.
(Would sometimes optimize away conacts used to extend a vector with undef values)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181186 91177308-0d34-0410-b5e6-96231b3b80d8
2013-05-06 08:06:13 +00:00
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