Fix IF NOT EXISTS in CREATE STATISTICS

I misplaced the IF NOT EXISTS clause in commit 7b504eb282, before the
word STATISTICS.  Put it where it belongs.

Patch written independently by Amit Langote and myself.  I adopted his
submitted test case with a slight edit also.

Reported-by: Bruno Wolff III
Discussion: https://postgr.es/m/20170621004237.gb8...@wolff.to

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/5dfd564b1001f20c9def6ae938a92f39ddbd9984

Modified Files
--------------
src/backend/parser/gram.y               | 25 ++++++++++++++++++-------
src/test/regress/expected/stats_ext.out |  6 ++++--
src/test/regress/sql/stats_ext.sql      |  5 +++--
3 files changed, 25 insertions(+), 11 deletions(-)


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