Function cranelift_codegen::ir::get_libcall_funcref

pub fn get_libcall_funcref(
    libcall: LibCall, 
    call_conv: CallConv, 
    func: &mut Function, 
    inst: Inst, 
    isa: &dyn TargetIsa
) -> FuncRef

Get a function reference for libcall in func, following the signature for inst.

If there is an existing reference, use it, otherwise make a new one.