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120880c780
We were creating external uses for scalar values in MustGather entries that also had a ScalarToTreeEntry (they also are present in a vectorized tuple). This meant we would keep a value 'alive' as a scalar and vectorized causing havoc. This is not necessary because when we create a MustGather vector we explicitly create external uses entries for the insertelement instructions of the MustGather vector elements. Fixes PR18129. radar://15582184 llvm-svn: 196508
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