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Author SHA1 Message Date
Ahmed Bougacha 87166905c8 [CodeGen] Check FoldConstantArithmetic result before using it. 
Fixes PR24602: r245689 introduced an unguarded use of
SelectionDAG::FoldConstantArithmetic, which returns 0 when it fails
because of opaque (hoisted) constants.

llvm-svn: 246217
 2015-08-27 21:46:04 +00:00