Add some temporary code to record stack usage at server process exit.

This patch is meant to gather information from the buildfarm members, and
will be reverted in a day or so.  The idea is to try to find out the
high-water stack consumption while running the regression tests,
particularly on IA64 which is suspected to use much more stack than other
architectures.  On machines with pmap, we can use that; but the IA64 farm
members are running HPUX, so also include some bespoke code for HPUX.
(I've tested the latter on HPUX 10/HPPA; not entirely sure it will work
on HPUX 11/IA64, but we'll soon find out.)

Discussion: <cam-w4hmwwcwavvycah0_fgtg5gexdyvrfvg81pxnsjwhncf...@mail.gmail.com>

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/88cf37d2a86d5b66380003d7c3384530e3f91e40

Modified Files
--------------
src/backend/storage/ipc/ipc.c | 47 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)


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