[X86] Fix the lower1BitShuffle code added in r369215 to correctly pass the...

[X86] Fix the lower1BitShuffle code added in r369215 to correctly pass the widened vector to the KSHIFT node.

Not sure how to test this as we have tests that exercise this code,
but nothing failed for the types not matching. Since all the k-registers
use equivalent register classes everything just ends up working.

llvm-svn: 369228