Non-TFmode targets broken with "[fortran,patch] Complete front-end support for __float128"

[FX]

Hi Andrew,

> Yes because TImode is defined in machmode.def which is unlike TFmode
> which is not included in all targets.

I see how your patch avoids this issue, but it seems a bit overkill to me to check all builtin types just to catch one :)

I think GET_MODE_PRECISION(mode) == 128 achieves the same goal as (mode == TFmode).

FX