mips64-linux n32/n64 long doubles

[Eric Christopher]

These are OK with the cleanup for this:

>    if (GET_MODE_CLASS (mode) == MODE_FLOAT
> -      && GET_MODE_SIZE (mode) <= UNITS_PER_FPVALUE)
> +      && GET_MODE_SIZE (mode) <= UNITS_PER_FPVALUE * ((mips_abi == ABI_N32
> +						       || mips_abi == ABI_64)
> +						      ? 2 : 1))

that we talked about.

-eric

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