pgsql: Fix possible crash due to incorrect allocation context.

Fix possible crash due to incorrect allocation context.

Commit af33039317ddc4a0e38a02e2255c2bf453115fd2 aimed to reduce
leakage from tqueue.c, which is good. Unfortunately, by changing the
memory context in which all of gather_readnext() executes, it also
changed the context in which ExecShutdownGatherWorkers executes, which
is not good, because that function eventually causes a call to
ExecParallelRetrieveInstrumentation, which proceeds to allocate
planstate->worker_instrument in a short-lived context, causing a
crash.

Rushabh Lathia, reviewed by Amit Kapila and by me.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/41fb35fabf03bffa812caddf24323d4d06f811ba

Modified Files
--------------
src/backend/executor/execParallel.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)