ARC fixes backport for stable 3.11

[Vineet Gupta]

Hi Greg,

Can you please apply the following mainline commits to your queue for next 3.11
stable, in that order.

7efd0da2d173 ARC: Fix __udelay calculation
c11eb222fd7d ARC: Handle zero-overhead-loop in unaligned access handler
0752adfda15f ARC: Fix 32-bit wrap around in access_ok()
6c00350b573c ARC: Workaround spinlock livelock in SMP SystemC simulation
10469350e345 ARC: Fix signal frame management for SA_SIGINFO
5b24282846c0 ARC: Ignore ptrace SETREGSET request for synthetic register "stop_pc"

Thx,
-Vineet
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