new helper: signal_delivered()

Does block_sigmask() + tracehook_signal_handler();  called when
sigframe has been successfully built.  All architectures converted
to it; block_sigmask() itself is gone now (merged into this one).

I'm still not too happy with the signature, but that's a separate
story (IMO we need a structure that would contain signal number +
siginfo + k_sigaction, so that get_signal_to_deliver() would fill one,
signal_delivered(), handle_signal() and probably setup...frame() -
take one).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/openrisc/kernel/signal.c b/arch/openrisc/kernel/signal.c
index 53972b7..3011029 100644
--- a/arch/openrisc/kernel/signal.c
+++ b/arch/openrisc/kernel/signal.c
@@ -259,8 +259,7 @@
 	if (ret)
 		return;
 
-	block_sigmask(ka, sig);
-	tracehook_signal_handler(sig, info, ka, regs,
+	signal_delivered(sig, info, ka, regs,
 				 test_thread_flag(TIF_SINGLESTEP));
 }