Remove duplicate TOP insertions, drop unused defs.

parser.y

@@ -278,10 +278,7 @@ FuncDef FuncDefs {
 
 Exp:
 FuncDef Exp %prec ';' {
-  if (block_is_funcdef($2))
-    $$ = block_bind($1, $2, OP_IS_CALL_PSEUDO);
-  else
-    $$ = block_bind($1, BLOCK(gen_op_simple(TOP), $2), OP_IS_CALL_PSEUDO);
+  $$ = block_bind_referenced($1, $2, OP_IS_CALL_PSEUDO);
 } |
 
 Term "as" '$' IDENT '|' Exp {