re: NetBSD/vax 11.0RC1

> don't use -pipe

ah... unfortunately, this is a thing i turned on on my build
machine, it isn't used my default -- my vax is cc1plus'ing to
a temp.s file.

.. and my netbsd-11 256mb simh completed gimple-match.cc, and
has moved onto generic-match.cc.

i know vax uses less memory than amd64 but i think that we
now can guess that gcc12's gimple-match.cc takes a bit over
400mb to compile, not the >900mb i saw on amd64.  i have also
been running "vmstat 10" in a window, and the two reports
either side of that cc1plus exiting are:

 procs    memory      page                       disks   faults      cpu
 r b      avm    fre  flt  re  pi   po   fr   sr r0 r2   in   sy  cs us sy id
 1 0   485004   4324   13   0   1   11   17   17  1  1  105   49  15 95  5  0
 3 0    79144 170812   15   0   4    0    0    0  3  2  110   56  16 66 34  0

other evidence is Ken's reports with 512mb and hangs happening
with ~50MB of free ram, but that's less clear.  note that "avm"
above includes active ram *and* swap..


so, it seems like the hang-bug we're seeing is not 100% always
reproducible :-)  but maybe 90+% ..


BTW, i commited a fix to vax ddb backtrace that i tripped up
on a couple of times, and plan to get it into -11.


.mrg.