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

[Djordje Todorovic via cfe-commits]

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@@ -1501,7 +1501,9 @@ bool clang::driver::findMIPSMultilibs(const Driver &D,
                       CPUName == "mips64r5" || CPUName == "octeon" ||
                       CPUName == "octeon+",
                   "-march=mips64r2", Flags);
-  addMultilibFlag(CPUName == "mips64r6", "-march=mips64r6", Flags);
+  addMultilibFlag(CPUName == "mips64r6" || CPUName == "i6400" ||
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djtodoro wrote:

this as well needs clang-format

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