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[ConstantFold][SVE] Fold bitcast into splat value for splat vector.
Needs ReviewPublic

Authored by huihuiz on Feb 5 2020, 3:32 PM.



Split from D71389, as it depends on D71637.

I am not 100% confident about the general impact of D71637, if we
support constexpr in all OneOps_match, TwoOps_match and ThreeOps_match.

Split first to unblock D71389.

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