[MIPS] Reland Scheduling model for MIPS i6400 and i6500 CPUs (#132704) (#137984)
Relands #132704 with a fix in the testcase:
Add llvm/test/tools/llvm-mca/Mips/lit.local.cfg
Add scheduling model for the MIPS i6400 and i6500, an in-order MIPS64R6
processor.
i6400 and i6500 share same instruction latencies.
CPU has following pipelines
- Two ALUs
- Multiply and Divide unit (MDU)
- Branch Unit (CTU)
- Load/Store Unit (LSU)
- Short Floating-point Unit and
- Long Floating-point Unit
Latency information is available at:
https://mips.com/wp-content/uploads/2025/03/MIPS_I6500-F_Data_Sheet_Rev1.10_3-17-2025.pdf