pgsql: Report memory context stats upon out-of-memory in repalloc[_huge

Report memory context stats upon out-of-memory in repalloc[_huge].

This longstanding functionality evidently got lost in commit
3d6d1b585524aab6. Noted while studying an OOM report from Jaime
Casanova. Backpatch to 9.5 where the bug was introduced.

Branch
------
REL9_5_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/a7915f114aad83c93548dffe6c947e7f441fc175

Modified Files
--------------
src/backend/utils/mmgr/mcxt.c | 6 ++++++
1 file changed, 6 insertions(+)

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