tcg: Remove branch-to-next regardless of reference count

tcg: Remove branch-to-next regardless of reference count

Just because the label reference count is more than 1 does
not mean we cannot remove a branch-to-next.  By doing this
first, the label reference count may drop to 0, and then
the label itself gets removed as before.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>