LLVM:Understanding emitBBAddrMapSection

I want to ask my question about the function emitBBAddrMapSection. This function is defined in AsmPrinter.
According to its comments, my understanding is that it will send the basic block symbol and offset address information of the basic block to the memory together. I don’t know if my understanding is wrong. I used the following example, but I did not find the relevant content of .llvm_bb_map in the executable file it generated. Is it my misunderstanding or my operation? Hope to get your help.
My example is as follows.
The contents of the executable file generated by readelf are as follows: