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Author SHA1 Message Date
David Majnemer f1a9c9e148 [SCCP] Don't violate the lattice invariants 
We marked values which are 'undef' as constant instead of undefined
which violates SCCP's invariants.  If we can figure out that a
computation results in 'undef', leave it in the undefined state.

This fixes PR16052.

llvm-svn: 257102
 2016-01-07 21:36:16 +00:00