[clang] [llvm] [X86] Support apxf in attribute target (PR #184078)

[Mikołaj Piróg via llvm-commits]

================
@@ -179,6 +179,31 @@ bool X86TargetInfo::initFeatureMap(
       continue;
     }
 
+    // Expand apxf to the individual APX features
----------------
mikolaj-pirog wrote:

This behavior is surprising, I believe we should disable everything with -no options. Consider example where subfeatures are enabled and then no-apxf is used, and some features stay enabled.

I've added disabling of `cf` as well

https://github.com/llvm/llvm-project/pull/184078