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* Atomics: promote ARM's IR-based atomics pass to CodeGen.Tim Northover2014-04-171-0/+336
Still only 32-bit ARM using it at this stage, but the promotion allows direct testing via opt and is a reasonably self-contained patch on the way to switching ARM64. At this point, other targets should be able to make use of it without too much difficulty if they want. (See ARM64 commit coming soon for an example). llvm-svn: 206485
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