Function LLVMGetNamedMetadataName 

pub unsafe extern "C" fn LLVMGetNamedMetadataName(
    NamedMD: LLVMNamedMDNodeRef,
    NameLen: *mut usize,
) -> *const c_char

Retrieve the name of a NamedMDNode.

@see llvm::NamedMDNode::getName()