[clang] [clang][Driver] Restore -cl-fast-relaxed-math fast-math cascade at cc1 level (PR #211768)

[Hardik Kumar via cfe-commits]

https://github.com/hardikxk commented:

Are you aiming to just fully restore the implementation as it was or try wroking around it? Since adding the KeyPath back in wouldn't lead us to anything different.

I will take a better look at these in a bit maybe until then you can also check up on the CI failures.

https://github.com/llvm/llvm-project/pull/211768