longlong.h: __udiv_qrnnd

[Richard Kenner]

    *shrug*  Does it matter?  AFAIK we don't use anything from
    longlong.h in gcc on Alpha.  That gets used in like libgcc2's
    __divdi3 etc, which never gets used.

Interesting you asked.  ;-)

bitsizetype on Alpha is 128 bits, so we can get TImode arithmetic.  I
added the proper #define's in longlong.h to make that be divti3 and
such for 64-bit hosts.  Then I run into the above problem.