59e1870182
The settings in arith.h were not fully defined on powerpc64 after the gdtoa switchover. Generate them using arithchk.c, similar to what AMD64 did for r114814. Technically, none of this is necessary in FreeBSD gdtoa, but since the other platforms have full definitions, we might as well have full definitions too. Approved by: jhibbits (in irc) Differential Revision: https://reviews.freebsd.org/D22775