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Commit 87166905 authored by Ahmed Bougacha's avatar Ahmed Bougacha
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[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
parent 8f5e331d
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