[EXTINT][OMP] Fix _ExtInt type checking in device code

_ExtInt gets stuck in the device-type-checking for __int128 if it is
between 65 and 128 bits inclusive.  Anything larger or smaller was
permitted despite this, so this is simply enabling 65-128 bit _ExtInts.
_ExtInt is supported on all our current ABIs, but we stil use the
hasExtIntType in the target info to differentiate here so that it can be
disabled.