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[X86][SSE] Add PACKSS with zero shuffle masks.

Authored by RKSimon on Jul 15 2019, 8:43 AM.

Description

[X86][SSE] Add PACKSS with zero shuffle masks.

This is an example of expansion due to D61129 - it should combine back to a PACKSS with a zero operand.

llvm-svn: 366077

Details