LLVM:Understanding emitBBAddrMapSection

HI.
I want to ask my question about the function emitBBAddrMapSection. This function is defined in AsmPrinter.
1`QBLFILYHR1JD}D1{8
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.
BPSH{K7Z}B)4ZTHHBMRGD
The contents of the executable file generated by readelf are as follows: