[clang] [CIR] Upstream missing support for floating point unary operator (PR #193215)

[Haocong Lu via cfe-commits]

Luhaocong wrote:

Sorry for the delay. I just updated the code which uses `cir.fadd/cir.fsub/cir.fneg` for floating point unary operator.

https://github.com/llvm/llvm-project/pull/193215