[clang] [clang] fp options fix for __builtin_convertvector (PR #134102)

[Jakub Ficek via cfe-commits]

ficol wrote:

Hi @shafik, could you please check this? It's a small fix that was missing in https://github.com/llvm/llvm-project/pull/125522

https://github.com/llvm/llvm-project/pull/134102