Changed evaluation order of yield; ref #3613

So that `yield expr_with_error` will cause the error from the
argument rather than `LocalJumpError` when no block is given.

mrbgems/mruby-compiler/core/codegen.c

@@ -2017,7 +2017,6 @@ codegen(codegen_scope *s, node *tree, int val)
         if (!s2) break;
       }
       if (s2) ainfo = s2->ainfo;
-      genop(s, MKOP_ABx(OP_BLKPUSH, cursp(), (ainfo<<4)|(lv & 0xf)));
       push();
       if (tree) {
         n = gen_values(s, tree, VAL, 0);
@@ -2027,6 +2026,7 @@ codegen(codegen_scope *s, node *tree, int val)
         }
       }
       pop_n(n+1);
+      genop(s, MKOP_ABx(OP_BLKPUSH, cursp(), (ainfo<<4)|(lv & 0xf)));
       if (sendv) n = CALL_MAXARGS;
       genop(s, MKOP_ABC(OP_SEND, cursp(), new_msym(s, mrb_intern_lit(s->mrb, "call")), n));
       if (val) push();