[COMMITTERS] pgsql: Fix performance bug in write_syslog(): the code to preferentially

Log Message:
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Fix performance bug in write_syslog(): the code to preferentially break the
log message at newlines cost O(N^2) for very long messages with few or no
newlines. For messages in the megabyte range this became the dominant cost.
Per gripe from Achilleas Mantzios.

Patch all the way back, since this is a safe change with no portability
risks. I am also thinking of increasing PG_SYSLOG_LIMIT, but that should
be done separately.

Tags:
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REL7_4_STABLE

Modified Files:
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pgsql/src/backend/utils/error:
elog.c (r1.125.2.3 -> r1.125.2.4)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/error/elog.c?r1=1.125.2.3&r2=1.125.2.4)

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