[clang] [Driver][X86] Add -m[no-]apxf to m_x86_Features_Group (PR #140874)

[Rainer Orth via cfe-commits]

rorth wrote:

This patch broke the [Solaris/amd64 buildbot](https://lab.llvm.org/staging/#/builders/120/builds/8977).  I suspect the test should use `--target=i386-pc-windows` instead of just `i386`?

https://github.com/llvm/llvm-project/pull/140874