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

[Mallikarjuna Gouda via llvm-commits]

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+// Check target CPUs are correctly passed.
+
+// RUN: %clang --target=mips64 -### -c %s 2>&1 -mcpu=i6400 -mmsa | FileCheck -check-prefix=MCPU-I6400 %s
+// MCPU-I6400: "-target-cpu" "i6400"
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mgoudar wrote:

I modified test to verify abicalls feature as well. I see that mips-features.c test available to verify other features based on the options

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