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

[Alexander Yermolovich via llvm-commits]

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@@ -396,6 +416,8 @@ class DebugAddrWriter {
 
     void dump();
 
+    bool empty = false;
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ayermolo wrote:

Shouldn't default be true?

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