[X86][AVX] Tests showing missing SHUFPD + ZERO lowering

This lowers to SHUFPD if the input is zeroinitializer but not with a demanded elts optimized build vector.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@298370 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed