[llvm] [MIPS] Add Scheduling model for MIPS i6400 and i6500 CPUs (PR #132704)

[Mallikarjuna Gouda via llvm-commits]

mgoudar wrote:

> Lets try to avoid `InstRW`.

Hi, thank you for the review and the feedback. We have started porting work. We will port all existing scheduling model for MIPS cpus to new scheduling API soon.

https://github.com/llvm/llvm-project/pull/132704