[X86] Don't create ZERO_EXTEND_INREG/SIGN_EXTEND_INREG for v1iX vectors.

The generic type legalizer will scalarize vXi1 instructions getting rid of the vector entirely. Creating wider vector instructions is just going to prevent that.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341705 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed