[llvm] [AMDGPU] Use std::optional in InstCombine of amdgcn_fmed3. NFC. (PR #108223)

[Shilei Tian via llvm-commits]

shiltian wrote:

Yeah, it seems like the boolean return value has the same semantics as `nullptr`.,

https://github.com/llvm/llvm-project/pull/108223