ida_bg.py

fn = 0x401F60
ollvm_tail = 0x405D4B

f_blocks = idaapi.FlowChart(idaapi.get_func(fn), flags=idaapi.FC_PREDS)
for block in f_blocks:
    for succ in block.succs():
        if succ.start_ea == ollvm_tail:
            print(hex(block.start_ea))
            idc.add_bpt(block.start_ea)