[X86] Remove an unused isel pattern that looked for pshufd with v4f32 type.

I don't believe our current lowering/combining would ever produce such a node. We only produce integer typed pshufds.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319068 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed