Initial pgindent run for v12.

This is still using the 2.0 version of pg_bsd_indent.
I thought it would be good to commit this separately,
so as to document the differences between 2.0 and 2.1 behavior.

Discussion: https://postgr.es/m/16296.1558103386@sss.pgh.pa.us

src/backend/utils/cache/syscache.c

@@ -1235,7 +1235,7 @@ GetSysCacheOid(int cacheId,
 	result = heap_getattr(tuple, oidcol,
 						  SysCache[cacheId]->cc_tupdesc,
 						  &isNull);
-	Assert(!isNull); /* columns used as oids should never be NULL */
+	Assert(!isNull);			/* columns used as oids should never be NULL */
 	ReleaseSysCache(tuple);
 	return result;
 }