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Commit e229ec5b authored by Alexey Samsonov's avatar Alexey Samsonov
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Fix null reference creation in SelectionDAG constructor. 

Store TargetSelectionDAGInfo as a pointer instead of a reference:
getSelectionDAGInfo() may not be implemented for certain backends
(e.g. it's not currently implemented for R600).

This bug is reported by UBSan.

llvm-svn: 216129
parent b8478abd
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