ghc-toolchain: Some os/arch combinations are not parsed in ParseTriple

I am comparing m4/ghc_convert_cpu.m4 and m4/ghc_convert_os.m4 and there are quite a few Arch/OS combinations which are not parsed by parseArch and parseOs.

For example, i686 is not parsed by parseArch.

Is this a deliberate decision or should these files agree with each other?

I think it's probably a mistake because we are missing things like loongarch64 and loongarch32.

cc @alt-romes

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