Don't VALGRIND_PRINTF() each query string.
Don't VALGRIND_PRINTF() each query string.

Doing so was helpful for some Valgrind usage and distracting for other
usage.  One can achieve the same effect by changing log_statement and
pointing both PostgreSQL and Valgrind logging to stderr.

Per gripe from Andres Freund.

jmcatamney/gpdb,jmcatamney/gpdb,adam8157/gpdb,Postgres-XL/Postgres-XL,xinzweb/gpdb,techdragon/Postgres-XL,50wu/gpdb,lisakowen/gpdb,ashwinstar/gpdb,ovr/postgres-xl,oberstet/postgres-xl,zeroae/postgres-xl,50wu/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,adam8157/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,ashwinstar/gpdb,xinzweb/gpdb,Postgres-XL/Postgres-XL,jmcatamney/gpdb,pavanvd/postgres-xl,oberstet/postgres-xl,ovr/postgres-xl,greenplum-db/gpdb,xinzweb/gpdb,adam8157/gpdb,jmcatamney/gpdb,xinzweb/gpdb,50wu/gpdb,zeroae/postgres-xl,50wu/gpdb,ashwinstar/gpdb,techdragon/Postgres-XL,greenplum-db/gpdb,techdragon/Postgres-XL,Postgres-XL/Postgres-XL,lisakowen/gpdb,Postgres-XL/Postgres-XL,yazun/postgres-xl,adam8157/gpdb,lisakowen/gpdb,oberstet/postgres-xl,50wu/gpdb,adam8157/gpdb,lisakowen/gpdb,yazun/postgres-xl,ovr/postgres-xl,lisakowen/gpdb,ovr/postgres-xl,50wu/gpdb,lisakowen/gpdb,yazun/postgres-xl,greenplum-db/gpdb,zeroae/postgres-xl,oberstet/postgres-xl,ashwinstar/gpdb,adam8157/gpdb,zeroae/postgres-xl,xinzweb/gpdb,zeroae/postgres-xl,jmcatamney/gpdb,pavanvd/postgres-xl,ashwinstar/gpdb,pavanvd/postgres-xl,oberstet/postgres-xl,greenplum-db/gpdb,Postgres-XL/Postgres-XL,pavanvd/postgres-xl,greenplum-db/gpdb,greenplum-db/gpdb,yazun/postgres-xl,adam8157/gpdb,adam8157/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,50wu/gpdb,techdragon/Postgres-XL,lisakowen/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,yazun/postgres-xl,techdragon/Postgres-XL,xinzweb/gpdb,xinzweb/gpdb,xinzweb/gpdb,ovr/postgres-xl,50wu/gpdb