Update copyright for 2019

Backpatch-through: certain files through 9.4

src/backend/lib/binaryheap.c

@@ -3,7 +3,7 @@
  * binaryheap.c
  *	  A simple binary heap implementation
  *
- * Portions Copyright (c) 2012-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 2012-2019, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *	  src/backend/lib/binaryheap.c

src/backend/lib/bipartite_match.c

@@ -7,7 +7,7 @@
  *
  * https://en.wikipedia.org/w/index.php?title=Hopcroft%E2%80%93Karp_algorithm&oldid=593898016
  *
- * Copyright (c) 2015-2018, PostgreSQL Global Development Group
+ * Copyright (c) 2015-2019, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *	  src/backend/lib/bipartite_match.c

src/backend/lib/bloomfilter.c

@@ -24,7 +24,7 @@
  * caller many authoritative lookups, such as expensive probes of a much larger
  * on-disk structure.
  *
- * Copyright (c) 2018, PostgreSQL Global Development Group
+ * Copyright (c) 2018-2019, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *	  src/backend/lib/bloomfilter.c

src/backend/lib/dshash.c

@@ -20,7 +20,7 @@
  * Future versions may support iterators and incremental resizing; for now
  * the implementation is minimalist.
  *
- * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION

src/backend/lib/hyperloglog.c

@@ -3,7 +3,7 @@
  * hyperloglog.c
  *	  HyperLogLog cardinality estimator
  *
- * Portions Copyright (c) 2014-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 2014-2019, PostgreSQL Global Development Group
  *
  * Based on Hideaki Ohno's C++ implementation.  This is probably not ideally
  * suited to estimating the cardinality of very large sets;  in particular, we

src/backend/lib/ilist.c

@@ -3,7 +3,7 @@
  * ilist.c
  *	  support for integrated/inline doubly- and singly- linked lists
  *
- * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/lib/knapsack.c

@@ -15,7 +15,7 @@
  * allows approximate solutions in polynomial time (the general case of the
  * exact problem is NP-hard).
  *
- * Copyright (c) 2017-2018, PostgreSQL Global Development Group
+ * Copyright (c) 2017-2019, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *	  src/backend/lib/knapsack.c

src/backend/lib/pairingheap.c

@@ -14,7 +14,7 @@
  *	The pairing heap: a new form of self-adjusting heap.
  *	Algorithmica 1, 1 (January 1986), pages 111-129. DOI: 10.1007/BF01840439
  *
- * Portions Copyright (c) 2012-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 2012-2019, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *	  src/backend/lib/pairingheap.c

src/backend/lib/rbtree.c

@@ -17,7 +17,7 @@
  * longest path from root to leaf is only about twice as long as the shortest,
  * so lookups are guaranteed to run in O(lg n) time.
  *
- * Copyright (c) 2009-2018, PostgreSQL Global Development Group
+ * Copyright (c) 2009-2019, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *	  src/backend/lib/rbtree.c

src/backend/lib/stringinfo.c

@@ -6,7 +6,7 @@
  * It can be used to buffer either ordinary C strings (null-terminated text)
  * or arbitrary binary data.  All storage is allocated with palloc().
  *
- * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *	  src/backend/lib/stringinfo.c