module AtomicRMWBinOp:sig..end
atomicrmw instruction.
    See llvm::AtomicRMWInst::BinOp.type | | | Xchg | 
| | | Add | 
| | | Sub | 
| | | And | 
| | | Nand | 
| | | Or | 
| | | Xor | 
| | | Max | 
| | | Min | 
| | | UMax | 
| | | UMin |