[X86] Change avx512-gather-scatter-intrin.ll to use x86_64-unknown-unknown instead of x86_64-apple-darwin. NFC

Will help with an upcoming patch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351521 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed