x86: signal: split out frame setups

Make setup_rt_frame() and split out frame setups from handle_signal().
This is for cosmetic unification of handle_signal().

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2 files changed