Add all the avx512 flavors to __builtin_cpu_supports's list.

This is matching what trunk gcc is accepting. Also adds a missing ssse3
case. PR27779. The amount of duplication here is annoying, maybe it
should be factored into a separate .def file?

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@270224 91177308-0d34-0410-b5e6-96231b3b80d8