[X86][SSE] Lower immediately to PACKUS instead of VECTOR_SHUFFLE.
As discussed on rL347240, this avoids some regressions on D54679 and also helps some combines to kick in a bit earlier. llvm-svn: 347300
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As discussed on rL347240, this avoids some regressions on D54679 and also helps some combines to kick in a bit earlier. llvm-svn: 347300