beblocksched: Do not put the end block into the block schedule.

This way all the backends do not have to filter it by themselves.

ir/be/beblocksched.c

@@ -179,6 +179,10 @@ static void collect_egde_frequency(ir_node *block, void *data)
 {
 	blocksched_env_t *env = (blocksched_env_t*)data;
 
+	/* Exclude the end block from the block schedule. */
+	if (block == get_irg_end_block(env->irg))
+		return;
+
 	edge_t edge;
 	memset(&edge, 0, sizeof(edge));
 
@@ -189,10 +193,9 @@ static void collect_egde_frequency(ir_node *block, void *data)
 	ir_loop *loop  = get_irn_loop(block);
 	int      arity = get_Block_n_cfgpreds(block);
 	if (arity == 0) {
-		/* must be the start block (or end-block for endless loops),
-		 * everything else is dead code and should be removed by now */
-		assert(block == get_irg_start_block(env->irg)
-				|| block == get_irg_end_block(env->irg));
+		/* must be the start block, everything else is dead code and should be
+		 * removed by now */
+		assert(block == get_irg_start_block(env->irg));
 		/* nothing to do here */
 		return;
 	} else if (arity == 1) {
@@ -493,6 +496,8 @@ static blocksched_entry_t *finish_block_schedule(blocksched_env_t *env)
 
 	ir_reserve_resources(irg, IR_RESOURCE_IRN_VISITED);
 	inc_irg_visited(irg);
+	/* Exclude the end block from the block schedule. */
+	mark_irn_visited(get_irg_end_block(irg));
 
 	env->worklist = new_pdeq();
 	ir_node            *const startblock = get_irg_start_block(irg);

ir/be/ia32/ia32_emitter.c

@@ -1484,10 +1484,6 @@ bool ia32_should_align_block(ir_node const *const block)
  */
 static void ia32_emit_block_header(ir_node *block)
 {
-	ir_graph *const irg = get_irn_irg(block);
-	if (block == get_irg_end_block(irg))
-		return;
-
 	if (ia32_cg_config.label_alignment > 0) {
 		/* align the current block if:
 		 * a) if should be aligned due to its execution frequency

ir/be/sparc/sparc_emitter.c

@@ -1453,10 +1453,7 @@ void sparc_emit_function(ir_graph *irg)
 	pick_delay_slots(n_blocks, block_schedule);
 
 	for (size_t i = 0; i < n_blocks; ++i) {
-		ir_node *block = block_schedule[i];
-		if (block == get_irg_end_block(irg))
-			continue;
-		sparc_emit_block(block);
+		sparc_emit_block(block_schedule[i]);
 	}
 	ir_free_resources(irg, IR_RESOURCE_IRN_LINK);