In v11, disable JIT by default (it's still enabled by default in HEAD).

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 0fdadfb0192935e0f8bec7fa5ec9dbb470d6d587
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-09-15T21:24:35Z
Releases: 11.0
In v11, disable JIT by default (it's still enabled by default in HEAD).

Per discussion, JIT isn't quite mature enough to ship enabled-by-default.

I failed to resist the temptation to do a bunch of copy-editing on the
related documentation.  Also, clean up some inconsistencies in which
section of config.sgml the JIT GUCs are documented in vs. what guc.c
and postgresql.config.sample had.

Discussion: https://postgr.es/m/20180914222657.mw25esrzbcnu6qlu@alap3.anarazel.de

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