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3d9f4e715f
We used to have this magic "hasLoadLinkedStoreConditional()" callback, which really meant two things: - expand cmpxchg (to ll/sc). - expand atomic loads using ll/sc (rather than cmpxchg). Remove it, and, instead, introduce explicit callbacks: - bool shouldExpandAtomicCmpXchgInIR(inst) - AtomicExpansionKind shouldExpandAtomicLoadInIR(inst) Differential Revision: http://reviews.llvm.org/D12557 llvm-svn: 247429
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