[llvm] [RISCV] Remove duplicate WriteRes<WriteJalr for MIPSP8700. (PR #123865)

[Craig Topper via llvm-commits]

topperc wrote:

> > Is this something we should enforce in TableGen -- no duplicates allowed?
> 
> does #123876 enforce this? Specifically when it's adding new WriteRes into the map.

Yes. It was enforce previously, but https://github.com/llvm/llvm-project/pull/92202 broke it. Without the early exit in the loop we would find two different WriteRes with the same WriteType.

#123876 adds back enforcement when we add to the map.

https://github.com/llvm/llvm-project/pull/123865