[PATCH] Use the load-acquire/store-release instructions optimally in AArch32

[Artyom Skrobov]

Hello,

This patch improves handling of atomic instructions in ARMv8 AArch32, basically porting Tim's earlier work (r179005, http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130408/170822.html) to the ARM backend.
The objective is to remove the barriers and to use the new load-acquire/store-release instructions, where possible.
The justification for this change is the same as in http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130408/170832.html


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