target/arm: Don't require helper prototypes in helper.c

In arm_cpu_do_interrupt_aarch64() we call the TCG helper function helper_rebuild_hflags_a64(), which requires helper.c to include the TCG helper function prototypes even when this file is being compiled with TCG disabled. We don't actually need to do this -- because we have already written the new EL into pstate and updated env->aarch64, we can call aarch64_rebuild_hflags() to achieve the same effect. This is the function we use everywhere else in this file to update hflags. Switch to aarch64_rebuild_hflags() and drop the include of the TCG helper headers. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Message-id: 20260219040150.2098396-3-pierrick.bouvier@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>