[llvm] [MIPS] Updated MIPS N calling conventions so that fp16 arguments no longer cause a crash (PR #116569)

[Nikita Popov via llvm-commits]

https://github.com/nikic approved this pull request.

LGTM. In the absence of a specified ABI and hardware support, I believe passing in integers is preferable.

cc @yingopq 

https://github.com/llvm/llvm-project/pull/116569