[SHT_LLVM_BB_ADDR_MAP] Add an option to skip emitting bb entries (#114447) Sometimes we want to use a `PgoAnalysisMap` feature that doesn't require the BB entries info, e.g. only the `FuncEntryCount`, but the BB entries is emitted by default, so I'm adding an option to skip the info for this case to save the binary size(can save ~90% size of the section). For implementation, it extends a new field(`OmitBBEntries`) in `BBAddrMap::Features` for this and it's controlled by a switch `--basic-block-address-map-skip-bb-entries`. Note that this naturally supports backwards compatibility as the field is zero for the old version, matches the decoding in the new version llvm.
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