rustc_llvm::LLVMBuildAtomicCmpXchg

pub unsafe extern fn LLVMBuildAtomicCmpXchg(B: BuilderRef, LHS: ValueRef, CMP: ValueRef, RHS: ValueRef, Order: AtomicOrdering, FailureOrder: AtomicOrdering, Weak: Bool) -> ValueRef

Unstable (rustc_private)