[X86][AVX] Sync with clang/test/CodeGen/avx2-builtins.c

Only tests for the gather intrinsic are still to be added

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@270710 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed