Revert "Skip WAL for new relfilenodes, under wal_level=minimal."

This reverts commit cb2fd7eac2.  Per
numerous buildfarm members, it was incompatible with parallel query, and
a test case assumed LP64.  Back-patch to 9.5 (all supported versions).

Discussion: https://postgr.es/m/20200321224920.GB1763544@rfd.leadboat.com

src/include/access/gist_private.h

@@ -425,8 +425,6 @@ extern XLogRecPtr gistXLogSplit(bool page_is_leaf,
 			  BlockNumber origrlink, GistNSN oldnsn,
 			  Buffer leftchild, bool markfollowright);
 
-extern XLogRecPtr gistXLogAssignLSN(void);
-
 /* gistget.c */
 extern bool gistgettuple(IndexScanDesc scan, ScanDirection dir);
 extern int64 gistgetbitmap(IndexScanDesc scan, TIDBitmap *tbm);

src/include/access/gistxlog.h

@@ -23,7 +23,6 @@
  /* #define XLOG_GIST_INSERT_COMPLETE	 0x40 */	/* not used anymore */
 #define XLOG_GIST_CREATE_INDEX		0x50
  /* #define XLOG_GIST_PAGE_DELETE		 0x60 */	/* not used anymore */
-#define XLOG_GIST_ASSIGN_LSN		0x70	/* nop, assign new LSN */
 
 /*
  * Backup Blk 0: updated page.

src/include/access/heapam.h

@@ -25,6 +25,7 @@
 
 
 /* "options" flag bits for heap_insert */
+#define HEAP_INSERT_SKIP_WAL	0x0001
 #define HEAP_INSERT_SKIP_FSM	0x0002
 #define HEAP_INSERT_FROZEN		0x0004
 #define HEAP_INSERT_SPECULATIVE 0x0008

src/include/access/rewriteheap.h

@@ -23,7 +23,7 @@ typedef struct RewriteStateData *RewriteState;
 
 extern RewriteState begin_heap_rewrite(Relation OldHeap, Relation NewHeap,
 				   TransactionId OldestXmin, TransactionId FreezeXid,
-				   MultiXactId MultiXactCutoff);
+				   MultiXactId MultiXactCutoff, bool use_wal);
 extern void end_heap_rewrite(RewriteState state);
 extern void rewrite_heap_tuple(RewriteState state, HeapTuple oldTuple,
 				   HeapTuple newTuple);