[clang] [llvm] [X86][APX] Remove CF feature from APXF and Diamond Rapids (PR #153751)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

> We usually use Tuningxxx due to hardware defects, which implies some hardware preform good while some bad. But here the problem is we haven't fully address regression to make it a net profit for performance.

I don't really see a difference between the two: if there's a compiler deficiency, that's still a code generation problem, not a issue with the underlying hardware feature.

Messing with the hardware features has other effects, like turning off assembler support.

https://github.com/llvm/llvm-project/pull/153751