alpha: tidy signal delivery up
* move force_sigsegv() (from setup...frame()) and clearing RESTART_SIGMASK
(from do_signal()) into hanlde_signal()
* get rid of handle_signal() return value and oldset argument
* checking for TIF_SIGPENDING is enough; set_restart_sigmask() sets this
one as well.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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