[clang] [clang] Set correct FPOptions if attribute 'optnone' presents (PR #85605)

[Serge Pavlov via cfe-commits]

spavloff wrote:

Hi @wjristow,

Thank you for your detailed analysis. Indeed, FPContract looks more like mandatory option rather than optional optimization. I prepared PR: https://github.com/llvm/llvm-project/pull/91061, which fixes this issue.

https://github.com/llvm/llvm-project/pull/85605