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Alex Zinenko 37d0d097a9 Drop AffineExpr::Null
Similarly to other value-type wrappers, the default constructor of AffineExpr
    constructs a null object and removes the need for an explicit ::Null
    constructor.  Drop it and remove the only user which can trivially rely on the
    default constructor.

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PiperOrigin-RevId: 249207502
2019-06-01 19:53:33 -07:00
mlir Drop AffineExpr::Null 2019-06-01 19:53:33 -07:00