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Commit 28303639 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86][SSE] combineVectorTruncation - enable (pre-SSSE3) vXi16->vXi8 truncation. 

Shuffle combining can now handle this output, and by performing this early in combineVectorTruncation we avoid a scalarization that caused a regression on D87502.
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