[X86][SSE] Begun generalizing truncateVectorWithPACKSS to work with PACKSS/PACKUS functions

Renamed to truncateVectorWithPACK

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317098 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed