Constant LLVMAtomicRMWBinOp_LLVMAtomicRMWBinOpFMinimum 

pub const LLVMAtomicRMWBinOp_LLVMAtomicRMWBinOpFMinimum: LLVMAtomicRMWBinOp = 20;

< Sets the value if it’s smaller than the original using an floating point comparison and return the old one