[llvm-branch-commits] [llvm] release/22.x: MIPSr6: Fix COPY of reg:fgr64cc without fcmp in the same BB (#185820) (PR #186008)

[YunQiang Su via llvm-branch-commits]

wzssyqa wrote:

> @wzssyqa can you provide some context for this change? Is it is a regression? If so, when was it introduced. I notice that your original change had a PR but was submitted without a review.
> 
> What would be the consequences if we did not accept this change? Would we generate bad code?

The compiler may crash on
```
assert(Opc && "Cannot copy registers");
```

https://github.com/llvm/llvm-project/pull/186008