[SHT_LLVM_BB_ADDR_MAP][llvm-readobj] Implements llvm-readobj handling for PGOAnalysisMap. (#79520)

Adds raw printing of PGOAnalysisMap in llvm-readobj.

I'm leaving the fixme's for a later patch that will provide a 'pretty'
printing for BBFreq and BrProb (i.e. relative frequencies and
probabilities) that will apply to both llvm-readobj and llvm-objdump.