[X86] Remove untested MOVDDUP patterns.

These all involve bitcasts around the memory operands. This isn't
something we normally do for isel patterns. I suspect DAG combine should
convert the load type making this unnecessary.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292050 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed