OpChain has subclasses, so add a virtual destructor.
Summary: OpChain has subclasses, so add a virtual destructor. This fixes an issue when deleting subclasses of OpChain (see MatchSMLAD() specifically) in r337701. Reviewers: javed.absar Subscribers: llvm-commits, SjoerdMeijer, samparker Differential Revision: https://reviews.llvm.org/D49681 llvm-svn: 337713
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