[patch] Shark reroute LLVM atomic intrinsics to Zero

[Xerxes Rånby]

Greetings,
This patch will make shark reroute LLVM atomic intrinsics to the 
existing atomic operations implemented in Zero.

This patch are both platform and arch independent.
I have tested this patch on Shark compiled for X86, PPC and ARM.

The benefit from a porters point of view is that once the atomic 
operation are implemented in Zero you get the atomic operations needed 
for Shark for free without having to extend LLVM.

I did this mainly because LLVM lacked atomic intrinsics in the ARM backend.

Cheers and have a great day!
Xerxes




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