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

[Serge Pavlov via cfe-commits]

spavloff wrote:

PR https://github.com/llvm/llvm-project/pull/92146 does not solve the problem of serialization mentioned above, but it is simple and quick solution for the reported crash.

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