Speed up dropping tables with many partitions.

We need to lock the parent, but we don't need a relcache entry
for it.

Gao Zeng Qi, reviewed by Amit Langote

Discussion: 
http://postgr.es/m/cafmbtr0ukqjjrjehpwl5wt4rnmrjuuxggvagxpr3syyh3e+...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/c1e0e7e1d790bf18c913e6a452dea811e858b554

Modified Files
--------------
src/backend/catalog/heap.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)


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