pgsql: Get rid of blinsert()'s use of GenericXLogUnregister().

Get rid of blinsert()'s use of GenericXLogUnregister().

That routine is dangerous, and unnecessary once we get rid of this
one caller.

In passing, fix failure to clean up temp memory context, or switch
back to caller's context, during slowest exit path.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/80cf18910c8edf2575c306dde9ead192bdb0863a

Modified Files
--------------
contrib/bloom/blinsert.c | 69 ++++++++++++++++++++++++++++--------------------
1 file changed, 41 insertions(+), 28 deletions(-)

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