[clang] [llvm] [MIPS] Add MIPS i6400 and i6500 processors (PR #130587)

[Djordje Todorovic via cfe-commits]

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@@ -238,13 +238,10 @@ def ImplP5600 : SubtargetFeature<"p5600", "ProcImpl",
                                  "MipsSubtarget::CPU::P5600",
                                  "The P5600 Processor", [FeatureMips32r5]>;
 
+// I6500 is multicluster version of I6400. Both are based on same CPU.
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djtodoro wrote:

nit: `The I6500 is the multi-cluster version of the I6400. Both are based on the same CPU architecture.`

https://github.com/llvm/llvm-project/pull/130587