Remove PF_USED_FOR_ASSERTS_ONLY from variables in general use

fsstate in process_pending_requests (in postgres_fdw.c) was added in
8998e3cafa as an assertion-only variable,  1ec7fca859 stated using
the variable outside of assertions.

rd_index in get_index_column_opclass (in lsyscache.c) was introduced
in 2a6368343f, and then promptly used in the fix commit 7e04160390
shortly thereafter.

This removes the PG_USED_FOR_ASSERTS_ONLY variable decoration from
the above mentioned variables.

Reviewed-by: Greg Nancarrow <gregn4422@gmail.com>
Discussion: https://postgr.es/m/F959106C-0F21-43A5-B2AE-D007D51ACBEE@yesql.se

contrib/postgres_fdw/postgres_fdw.c

@@ -7058,7 +7058,7 @@ void
 process_pending_request(AsyncRequest *areq)
 {
 	ForeignScanState *node = (ForeignScanState *) areq->requestee;
-	PgFdwScanState *fsstate PG_USED_FOR_ASSERTS_ONLY = (PgFdwScanState *) node->fdw_state;
+	PgFdwScanState *fsstate = (PgFdwScanState *) node->fdw_state;
 
 	/* The request would have been pending for a callback */
 	Assert(areq->callback_pending);

src/backend/utils/cache/lsyscache.c

@@ -3462,7 +3462,7 @@ Oid
 get_index_column_opclass(Oid index_oid, int attno)
 {
 	HeapTuple	tuple;
-	Form_pg_index rd_index PG_USED_FOR_ASSERTS_ONLY;
+	Form_pg_index rd_index;
 	Datum		datum;
 	bool		isnull;
 	oidvector  *indclass;