pgsql: Test pg_stat_statements across crash restart

Test pg_stat_statements across crash restart

Add 'pg_stat_statements' to the crash restart test, to test that
shared memory and LWLock initialization works across crash restart in
a library listed in shared_preload_libraries. We had no test coverage
for that.

Reviewed-by: Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>
Discussion: https://www.postgresql.org/message-id/CAExHW5vM1bneLYfg0wGeAa=52UiJ3z4vKd3AJ72X8Fw6k3KKrg@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/148fe2b05df592f5bca575b4e5e8a4253ea5a3ce

Modified Files
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src/test/recovery/t/013_crash_restart.pl | 33 ++++++++++++++++++++++++++++----
1 file changed, 29 insertions(+), 4 deletions(-)