[llvm] [BOLT][DWARF][NFC] Refactor address writers (PR #98094)

[Alexander Yermolovich via llvm-commits]

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@@ -408,14 +434,17 @@ class DebugAddrWriter {
   }
 
   BinaryContext *BC;
-  /// Maps DWOID to AddressForDWOCU.
-  std::unordered_map<uint64_t, AddressForDWOCU> AddressMaps;
+  /// Address for the DWO CU associated with the address writer.
+  AddressForDWOCU Map;
+  uint8_t AddressByteSize;
+  std::optional<uint64_t> AddrOffsetSectionBase;
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ayermolo wrote:

This is only used for DWARF5 stuff right?
If yes move to DebugAddrWriterDwarf5, and initialize with constructor.

https://github.com/llvm/llvm-project/pull/98094