[clang] [llvm] [MIPS] Add FeatureMSA to i6400 and i6500 cores (PR #134985)

[Mallikarjuna Gouda via llvm-commits]

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+; Test the MSA intrinsics that are encoded with the SPECIAL instruction format.
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mgoudar wrote:

I have written driver test mips-cpus.c instead of codegen as you suggested.

https://github.com/llvm/llvm-project/pull/134985