[llvm] [MIPS] Fix miscompiles consecutive half operations (PR #110199)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

> Fix #97975.

This only fixes it for the MIPS architecture, so should not close the issue with "Fix".

The fix itself here looks fine to me, but I feel like the test coverage is very weak. There's just that one test, and because it's not a generated one, it omits too much information to even tell if the assembly is correct.

https://github.com/llvm/llvm-project/pull/110199